A Guide to Choosing Best Power Tool Battery for Your Cordless Tools

The world of power tool batteries has been going through major technological advancements. Currently, many homeowners, craftsmen, and businesses have more options when it comes to selecting the best battery for their cordless power tool. They can already determine what works well for them in terms of capacity, compatibility, longer runtimes and extended cycle life of their batteries.

The true fact remains that for efficiency and optimal output to manifest, power tool batteries must function as well. There are credible brands on the market now, and each of these is aware of the need for a tool that has batteries that are not only powerful but also have the components that make work much easier, faster, and longer.

Ideal power tool batteries function better when well-aligned to the machine and the user. Components and features include as the perfect amount of battery capacity, charge time and temperature tolerance. So, the result is that many brands are working around the clock to meet the needs of all users.

Check: The Best Power Tool Battery You Can Buy Now

What Do All the Battery Characteristics Mean?

Cycle

The cycle of a battery is determined by the number full charge and discharge cycles. This is before its functional capacity falls to below 80% of its original capacity. A battery’s life cycle takes into consideration the number of charges and discharges before it becomes obsolete.

There are many factors that determine the number of cycles that a battery undergoes before it makes its final bow; these include the discharge rate and depth of discharge. The battery’s operating temperature and charging methods are also key considerations.

When it comes to cycle life, users consider it with other accompanying and supportive features such as runtime. A case in point is where users would go for Li-ion irrespective of its shorter cycle life, but it is then not an issue especially if you want to keep your power tool operating for a longer time.

Self-discharge

Self-discharge occurs when the electrical capacity of the battery is lost, mostly because the cell is sitting on the shelf and not active at all. Electrical and internal chemical reactions within the cell are what initiates self-discharge, in what looks like the exertion of a small external load. This automatically reduces the stored charge of the battery.

Self- discharge is one key reason for the decrease in the shelf life of a battery. When in use, the battery tends to function at less than full charge simply because of self-discharge.

The truth is that self-discharge does not pose huge problems at all, especially if your power tool does not require storage. But for those using their power tool occasionally, they may want to purchase batteries that have a slower self-discharge. This is because their tools and battery will have to be inactive during some periods.

Memory Effect

Also known as lazy battery effect, memory effect occurs when there’s a reduction in the durability of a battery’s charge. This is a consequence of repeated recharging after incomplete discharge in earlier usages. The frequent recharging in effect causes the crystalline structure of the electrodes to manifest differently.

The capacity of the charging system is also gradually reduced. In this case, the battery tries to remember and function on the small capacity. There are several causes of memory effect/ these include:

Repeated partial charges
The make of the battery; there are some models that develop memory effect in cases of incomplete discharge before recharging.
High or low rates of discharge
When the charging time is limited and inadequate
The charger is itself is poorly designed or malfunctioning

Memory effect reduces the capacity of the battery in later and subsequent recharges. At the same time, the battery life is also reduced.

Different designs and models react differently to the memory effect. Some of them do not experience memory effect at all, while others undergo significant levels of the same.

However, if you are looking for power tool batteries for your cordless tool, you shouldn’t let the issue of memory effect scare you. Some batteries react just as well to the situation especially if you know what buttons to press. For instance, the nickels are quite vulnerable to memory effect, yet they tend to retain the capacities once they are charged. The charging is best done once they have dropped to less than 70 %. Another trick is to allow them to discharge deeply once in a while; this helps them to remember their initial true capacities.

Voltage

Basically, Voltage in a battery signifies the difference in electric potential between the positive and negative terminals of a battery. One terminal is positively charged, and the other is negatively charged. If there is a big difference in the potential, it leads to a greater voltage. In essence, voltage is what determines the amount of energy a battery can discharge at one single time.

Charging a battery makes the voltage rise while discharging makes the voltage to fall low. It is like stretching and releasing a rubber band. There is an increase in both temperature and pressure during charge, hence increasing the voltage. Over-exertion and uncontrolled increase of the same can easily lead to rupture and explosion of the battery. In the same way, discharging the battery below the recommended capacity’s lower voltage can also lead to permanent damage to the battery.

The range in voltage is reflected in the size of each battery. The range also depends on the material the battery has been created from. In the case of the power tools, the higher the voltage, the heavier the work it can possibly handle.

Generally speaking, the choice of voltage depends largely on work density. For instance, batteries that come in lesser voltage handle lighter work. The amount of voltage for that kind of work is 7V-15V, while heavy work translates into more than 18V.

Capacity

Battery capacity is determined and measured in ampere-hours. As such, Ah is the discharge current that a battery delivers over a period of time. It is possible to install with a higher Ah, than specified, to allow for longer runtime; at the same time, using a smaller pack than specified, allows for shorter runtime.

As is expected, chargers often have some tolerance when it comes to Ah. This then allows larger batteries to take a longer time to charge, as compared to a smaller pack.

As you look to purchase batteries for your cordless power tools, it helps to know their Ah. For instance, when the Ah is higher, the runtime is longer, and battery use also takes longer before you recharge.

Type of Power Tool Battery

Batteries are essential, as, without them, devices and tools become useless. When it comes to using power tools, there are so many options in terms of specifications, performance and even features. Your selection is based on what kind of features suit your power tool the best, but also on the amount of work output you would like to achieve.

NiCd

Known as Nickle Cadmium in full, these battery types have been in use for a much longer time than the rest. They remain in use because of their tough construction. Apart from being less expensive, they have a longer cycle life, too.

Pros

They are quite tough, hence difficult to suffer damage as a result of impact and heat.
You have many options in terms of sizes and shapes.
When well taken care of, the battery is quite long-lasting.
With a cycle life of more than 1000 charges, they are significantly durable.
Compared to other types of batteries in the same category, they are less expensive.
The current flow that they generate is quite strong

Cons

NiCd batteries are naturally heavy and inconveniencing in terms of mobility.
In comparison to other types, they have lower charging capacity and lower energy density.
If they are not allowed to deep discharge once each month, they can suffer damage and a shorter cycle life resulting from the memory effect.
The toxicity metals that are found in these batteries can be harmful to the environment and disposing of the same after use may be challenging.

NiMH (Nickle Metal Hydride)

Being one of the new technologies on the market, NiMH is actually an improved version of NiCd. This type is more efficient as it comes with increased capacity. Here are the clear advantages of NiMH.

Pros

They operate at a lower voltage and are known for their ability to power devices for longer times as compared to other batteries.
They are much lighter and easily portable.
They are less costly as compared to Li-ion.
They are available in standard sizes such as AA, C, and D. This allows for their use in everyday situations apart from the power tools.
They are also environmentally friendly and you can safely dispose of them.

Cons

While in storage, NiMH is known to lose about 1% to 5% charge every day. The meaning of this is that you might just have to charge it right before use. In case of an emergency, this could be quite inconveniencing.
If you recharge a NiMH battery that has been fully discharged, it results into voltage depression and voltage depletion; this causes a shorter cycle life of the battery.
The batteries are very sensitive to temperature, so you need to avoid extreme temperatures. The ideal temperature is about 33 degrees centigrade.

Li-ion (Lithium Ion)

These are the undisputed leader in the category of power tool batteries.
Being the newest, yet most powerful of the three and more expensive, these batteries come with many advantages.

Pros

They are a lightweight. This means that you can fit them in your hand, yet they remain quite powerful and efficient.
Self-discharge for these batteries is low, so they can stay unused for a long time and yet still work perfectly when you pick them up for use. They will still be as good as new.
The batteries also present high potential current, which allows you to handle heavy drill workload.
They are safe and environmentally friendly; disposing of them does not cause harm at all.
They do not self-discharge and have no memory effect. This allows them to function optimally and have a longer cycle life.

Cons

Lithium-Ion batteries are more expensive to manufacture; once put on sale, the high price is passed on to the consumers.
These batteries have shorter cycle life, and they tend to age quite fast in comparison to NiCd and NiMH. You do have to make a replacement within a short period of time.
There have been reported incidences of overheating, this can happen during recharge.
They are also sensitive to heat and impact, you have to be careful to store them at recommended temperatures

Comparison of Power Tool Battery Types
A number of characteristics are what define batteries:

-Cycle life: the cycle life for NiCd is more than 1000 charges; NiMH’s depends on correct storage and charging. Li-ion’s cycle life is short; presenting between 300-500 charges. This is equivalent to 2-3 years of use.
-Self -discharge: NiCd experience moderate self-discharge of between 15-20%.On the other hand, NiMH has fast self-discharge of 20-30%. Li-ion displays very slow self-discharge and sometimes none at all.
-Charge time: Charge time for the Nickels is quite fast, while Li-ion charge time is moderate.
-Capacity: NiCd comes with a low capacity of 1.2-2.2Ah.the capacity for NiMH is moderate with 2.3-3.0Ah.As for Li-ion, its capacity is high at 3.0Ah.
-Memory effect: If not well maintained, the memory effect for NiCd is usually high, while it’s moderate for NiMH, although this can be avoided with proper charging. Li-ion does not display experience memory effect.
-Sensitivity: NiCd is tough and not sensitive, while NiMH is highly sensitive to temperature. Li-ion is also quite sensitive to both heat and impact.

How to Choose Cordless Battery Replacement

Batteries come with different characteristics. But it all depends on your individual user needs which determine how you finally get to pick your cordless power tool battery replacement.

Choose a platform that gives you many options for your machine. For instance, the fact that Nickel is becoming scarce should lead you to make a choice that leans more towards lithium-ion.
The voltage you select should be the one that is more suitable for the type of work you are carrying out. If you work is that of handy types, then you could go for 12V, as it’s a lightweight and small in size.
For purposes of compatibility, stick to one manufacturer as well as battery type. This is because not all platforms conform to the same compatibility for tools, and switching is likely to mess up your machine and inconvenience you as well.

Power Tool Batteries Compatibility and Latest TECHNOLOGY

Power tools need to be compatible with the battery in order to function as required. You can easily encounter problems if the wrong battery is made to work in the wrong power tool. The way to go is to always be on the lookout to ensure that your power tool is as compatible as possible with the battery. Manufacturers are in a good position to know and identify correct compatibility.

It would be useful but not essential to read the earlier articles:Interchangeable Compatibility Is A Must For Cordless Power Tool Battery Packs

1. Dewalt Batteries: EXTREME PERFORMANCE

As recently as 2016, Dewalt has launched a superior version of the world’s first battery, Flexvolt. This Dewalt battery automatically changes its voltage as the user changes tools. What is more, it offers both increased power and extended runtime at work. The latest models that Dewalt has introduced recently include:

12.0 Ah Flexvolt battery; these batteries have been built to work with Dewalt tools meant for higher–power applications. With a compact size the same as their 9.O Ah Flexvolt battery, users rest assured of 6 times runtime. This is so, especially when used with Dewalt’s 20V Max tools.
Another excellent model is the 6.0Ah Flexvolt battery. This one comes with 4times runtime and switches its voltage to easily support MAX tools with 20V,6OV as well as 120V.

Dewalt Batteries Compatibility

20V MAX batteries power 20V MAX tools.

Knowing how crucial power tool compatibility is for overall efficiency, this brand has continued to introduce newer versions of Lithium-ion tools on the market. This is designed to incorporate features and compatibility in the power tools sector.

2. Bosch Batteries : CoolPack 2.0 system and Changeover from 10.8V to 12V

Bosch is a leader when it comes to innovative battery technology. Their CoolPack technology boasts of superior lithium-ion batteries that are greatly protected by good material. In addition, these batteries are 100% compatible with power tools; they have full percentage runtime as well as full percentage longer life.

Bosch’s latest technology includes the exceptional 14.4-36V lithium-ion batteries. These are made from favorable material to prevent issues of overheating. In addition, their Li-ion batteries currently on the market come with a high of 6.0Ah and 100% runtime.

What is evident is that other Bosch batteries are stocked by type. In the Li-ion category, you are met with 10.80V, as well as 18V battery types. You will also not miss out on Li-ions’ lesser voltage but equally, useful 7,2V meant for lighter projects.

NiCd latest series at Bosch are found in 12V,24V as well as 9.6V.In the meantime, NiMH comes in 12V,3.6V,14.40V and the greatest of them all at 36V.

Bosch Batteries Compatibility

For Bosch, they simply know that if the battery does not fit the power tool properly, then it is not the right one for the tool. The design of their tools means that the corresponding battery fits in as required; any slight deviation is a no.

The advantages of Bosch lithium-ion batteries are that they are made of sturdy and robust construction. They are also the smallest and lightest batteries on the market. They present no memory effect, and there are negligible amounts of self-discharge. What’s more, they are very powerful and not sensitive to temperature; they can easily operate at 0 degrees centigrade.

3. Makita Batteries : Lithium-ion Xtreme Technology

These are market winners in the area of lithium-ion batteries. The batteries are known for their impressively full compatibility to power tools. For instance, the newly introduced Makita 18V Lithium-ion 6.0 Ah is extremely powerful. It comes with increased performance and presents an exceptionally longer runtime. With a charge time of just 55 minutes, this battery is one that allows convenience.

Another introduction to their recent models is their 18V, 5.0Ah, and taking just 45 minutes to charge.
Meanwhile, their 18V 4.0Ah is also not left behind. With its 36 minute charge time, it equals its counterparts the 6.0 Ah,5.0AH, and 3.0Ah in weight and size as well.
The 18V LXT power tools conveniently work well with 3.0Ah and 1.2Ah batteries.

Makita Batteries Compatibility

These batteries are compatible with over 100 power tools. There is always an indication is on your power tool;

For instance, if your 18V power tool has a star on the connector plate, then you automatically know that it is compatible with the 18V, 6.0Ah, 5-0V, 4.0V and 3.0V battery. If you purchase an 18V Li-ion battery, it is built to work well with your 18V cordless power tool.

4. Milwaukee Batteries: REDLITHIUMHIGH OUTPUT BATTERY

The latest technology at Milwaukee is their M18 REDLITHIUM HIGH OUTPUT HD12.0 battery pack. With this pack, you get 50% more power. The increase in more power output is what results in more work output. The fact that it also runs on 50% cooler than usual makes this a battery of choice for increased efficiency. Craftsmen can apply their heavier power tools even harder and for prolonged periods.

Milwaukee M18 REDLITHIUM HD9.0 battery packs are also part of the latest technology. These enable cordless power tool users to handle even heavier work output than usual and for longer hours.

Not to be left out among these series are M18 REDLITHIUM XC5.0, M12 REDLITHIUM XC 3.0, and M12 XC. All these models come with great features to give superior output and quality which is what all users are truly looking for.

Milwaukee Batteries Compatibility

This battery pack is not only more versatile, powering over 150 power tools; it is also fully compatible with the over 150 power tools. Their intelligent system integrates compatibility in their batteries, charger and power tool.

5. RYOBI Batteries: 18V ONE+ SYSTEM and 40-VOLT SYSTEM

The new kid on the block from Ryobi is their 40 V 5.0 Ah Lithium-ion battery. It exudes extraordinary power and comes with longer runtime. It is an improved version of the standard RYOBI 40Volt high capacity battery. The great thing about it is that its lithium-ion power is fade-free. It also has an onboard battery life indicator.

The other latest series from Ryobi is the 40V 2.6Ah lithium-ion battery, compatible with a 40V machine and 40V charger.

In addition, RYOBI’s 18V ONE+ 6.0Ah lithium HP battery comes with such superior features which go a long way in ensuring superior and exemplary output. This is a type of model that gives users longer runtime and impressive performance. It also handles both heavier and faster tasks. Its sturdy built ensures the durability of the battery. But what’s more, it’s compatible with more than 100 power tools of the 18V ONE+ system from RYOBI.

RYOBI Batteries Compatibility

The 40V battery is fully compatible with all RYOBI 4OV power tools and 40V chargers. On the other hand, the 18V ONE+ system is compatible with 18V ONE+ power tools and chargers.

**6. Black & Decker Batteries: 20V and 40V MAX* System**

The advanced 20V and 40V MAX system are currently one of the most powerful and convenient battery designs for power tools. Within this system, users have more than 20 options to choose from. These include the very powerful 60V MAX 1.5Ah,40V MAX 1.5 Ah, Li-ion battery,20V MAX 1.5 Ah Li-ion and many others of the same category and alignment.

The advantage with these batteries is that they do not create memory effect and come as lightweights. What is even more exciting is that the batteries have a longer runtime.

Compatibility

The 40V batteries are fully compatible with all BLACK+DECKER 40V power tools. Likewise, 20V MAX series align well with 20V MAX tools. The list continues just in the same way, as the 60V MAX is part of the 60V MAX system.

7. Metabo Batteries: BATTERY PACK TECHNOLOGY

With a battery pack system introduced by Metabo comes in form of 18V,10.8 25.2 and 36V battery systems. This Metabo battery technology remains one of the leading brands on the market.

Their 18V battery pack system comes with favorable options of 2.0, 4.0, and 5.2 Ah.
In the meantime, the 36V lithium-ion battery packs are fully compatible with 36V cordless tools, which work by delivering concentrated energy.
Metabos’s LiHD technology is among the latest and most vibrant in the industry.

Their battery packs are to be found with 4.0, Ah, 5.5 Ah and 8.0 Ah.

The benefits with these batteries are that they can be stored for long periods on the shelf without self-discharge. They have also been designed with processor-controlled charge and discharge management. This is great because your battery will not be depleted quickly. The batteries are great performers with no sensitivity to temperatures.

Metabo Batteries Compatibility

This is one battery pack for every application, and it is fully compatible with all power tools that come with the 18V lithium-ion system.

Which is the best power tool batteries brand?

The versatile nature of many power tool batteries makes it difficult to pinpoint which exactly is the best among them all. However, Bosch clearly stands out for a number of reasons.

Their batteries are known for excellent performance and reliability
They boast of a well-rounded 12Vs and 18Vs category that many users love.

The only drawback for this brand is that it is not as active globally as would be recommended. For instance, it is quite active in Europe but lax in the US.

Power Tool Battery Future Technology

1. Carbon-Ion Cell Technology

As power tools continue to be technologically more advanced, there is a gap in terms of sufficient power that can handle them. For some time now, the battery has not progressed in terms of technology as quickly as the power tools have. Despite that being the case, the world is on the verge of a breakthrough when it comes to the power tools sector.

One of the next-generation technologies is the carbon ion battery technology. The batteries are designed to use carbon materials. These come with unique features and advantages. They are not only more sustainable, but they are also friendly to the environment. Emission of harmful substances into the air will be a thing of the past.

Charge time also promises to be at least twenty times faster than what It is now with lithium ion. With a projected ability to last more than 3,000 cycles, this is a cell that is quite durable and is equally safe from overheating and fire explosions.

2. 20700 Li-Ion Battery

The new model comes with higher capacity battery packs which are based on 20700 Li-ion battery cell size. They are cylindrically shaped, 20mm wide and 70mm long.

20700 cell size is a clear step forward from the current 18650. The advantage with this next generation model is that it comes with a good amount of capacity and longer runtime. The battery is indeed a lightweight and it’s not quite sensitive to temperature.

3. New chemistries: LITHIUM POLYMER

Newer technologies in the form of Lithium Polymer come with a rechargeable battery of lithium ion. By using polymer electrolyte, this is a distinct move from the use of liquid electrolyte. The batteries come with higher levels of energy as well as significant lightweight. Their potential to store as high energy as desired is also what will enhance safety levels and reliability for users.

The advantage with Li-Po is that they can be produced in any kind of shape. This gives manufacturers a free reign in the design of their power tools too. The rate of self-discharge is also quite negligible, about 5% each month.

They come enclosed in a flexible foil-type kind of case .This makes them stay unconstrained, unlike the lithium-ion ones which are equipped in a rigidly sturdy case.

With their lower weight and increased capacity, these batteries promise a longer cycle life and durability. Their runtime is also quite impressive. The only drawback is that If they are not used as recommended, you risk of overheating and explosions.

Proper Care & Treatment: Charging

Power tools batteries lose strength gradually and then become obsolete over time. It happens with age and too much usage.

However, before the inevitable happens, there are several things you can do for your battery; by caring for it and prolonging the time it serves you.

To care for, and maintain these batteries so that they serve you well, these are the things to consider:

Allow for consistent use. This means that you discharge your power tool as often as required. This then allows the battery to perform the work it was meant to do without being left to sit idle. By so doing, the battery’s electrons are active.
Avoid partial charging. To keep your battery as healthy as possible, ensure that it always charges until full capacity. The best thing about full charge is that it also gives you a longer run time, than if you just give it an incomplete charge. This especially applies to NiCd and NiMH. Li-ion allows for partial charges which do not harm the battery at all.
Keep your battery cool and dry. This serves to protect it from overheating and hard shocks. Some of these batteries are quite sensitive to temperature. For instance, if you are using Li-ion, then you have to be very careful of extreme temperature they can easily overheat. At the same time, keep the batteries away any kind of wetness and cold or wet surfaces. The drier your battery remains, the better for its cycle life and durability.
Avoid deep discharge for your battery. Always be on the lookout to notice if your power tool is showing any signs of weakening in its power. If that is the case, you can quickly charge it; alternatively, you can use a second charge battery to jump-start it. Ensure that the battery drains completely instead of running it down.
Utilize variable power settings on your power tool. For instance, if you have the option for lower settings on your power tool, using them could make your power tool to function for a long time than if you were applying the faster or medium mode.
Avoid overcharging your battery. Overcharging has a way of damaging and shortening the cycle life of your battery. To keep it as healthy and working well as possible, remove it from the charge once it has charged to full capacity. This will help you retain it for as long as possible.

How to Care and Store Power Tool Battery

In normal circumstances, batteries are created to be consistently in use.

The best way to keep a battery in good condition, therefore, is to let it be in use as much as possible.

But sometimes this is not always possible, and the battery has to be kept inactive. If you are keeping your power tools in an inactive mode, and your battery as well, there are ways to store it.

Is your project very power-hungry?, possibly at room temperature to keep your battery.
Place your battery in the original plastic case in which it came; once you have done that, place it gently in a box or wrap it in a soft cloth.
If you are storing your Li-ion batteries, ensure that they are just partially charged and not fully charged. They should also just be partially discharged, not fully discharged. The same method can be used for the Nickel batteries. Either way, go by what the manufacturers have instructed on how to store your battery.
After a long period of storage for your Nickel batteries, ensure that you recharge them once more before you start using. This is because, upon storage, they drain quite fast; and by the time you awaken them, they virtually have no charge in them.
As for Li-ion, once correctly stored as per instructions, you are bound to start using them without charging as they would still have retained their power.
If you have a freezer or refrigerator in the vicinity, be careful not to leave your battery on them. Damage can easily occur because of the cold temperatures which can affect your battery.

Aftermarket Power Tool Batteries

Are they worth buying? Yes indeed, they are worth buying.

Think of the times your batteries have gone dead in a row. Think also of the times you have made an order for your original, and you find that they are actually out of stock.

What of the time you urgently need to complete your project, and you discover your battery has gone dead, yet you do not have the money to order for the expensive original? These are the times you find out the value and benefit of the aftermarket power tool batteries.

Some of the advantages with the aftermarket batteries is that they can easily be found. Meanwhile, the original batteries may take longer to arrive after ordering.

They may not even be in stock by the time you are making your order. If you have really urgent projects on your hands, then you need another option.

Another advantage is the fact that they are more affordable compared to the originals. Also, they are available in identical shapes and easily fit in the power tool without complications. What is more, they come with extra capacity, so you have a longer run time, and your output is therefore on the higher side.

Rebuilt Power Tool Batteries

Rebuilding power tool batteries is a possibility. But this largely depends on the type of batteries that you would want to rebuild. For instance, Nickels do come in lower voltage. Most of them are 12V to 18V. Low voltage batteries pose less danger in case something goes awfully wrong.

Li-ion, on the other hand, is a no-go zone for rebuilding. Most of the voltage for Li-ion batteries is very high. Anything done out of the ordinary would lead to an explosion.

The advantage of rebuilding is that it helps in recycling old batteries which would otherwise increase toxic levels and bring their harmful effects to the environment.

Power Tool Battery Reconditioning

Reconditioning is one way to revive your battery and keep it working for a bit longer. Batteries which look dead can be rejuvenated and come out looking as good as new. The final outcome of a reconditioned battery, however, depends a lot on the make and chemistry of that battery.

The main reason as to why most Nickel batteries die is as a result of memory effect and crystal formation. Reconditioning can, therefore, be done to remove these two conditions and bring the battery back to life.

Conclusion

The power tool batteries industry is indeed an interesting yet critical one. For people wanting to get hold of a battery that is perfect and suitable for their kind of work, great insight and research help you to get one that serves you well.

The types of power tool batteries on the market right now have their own advantages and drawbacks. Still, it is possible to select one that has minimal disadvantages, and which matches the work output that you would want to achieve.

At last please share this guide with anyone you know that needs help with their cordless Power tool batteries. The more everyone knows, the best replacement rechargeable batteries will choose that’s good news for everyone. Thank you.

A Guide to Choosing Best Power Tool Battery for Your Cordless Tools