Category Archives: Battery Tips

Lithium-Ion / Li-ion Cordless Tools Batteries Features

Lithium-ion (Also called Li-ion) is a family of rechargeable battery types boasting one of the best energy densities, no memory effect, and a slow loss of charge when not in use. Because of these features, the Li-ion battery powered cordless tools are designed more and more.

Let us know more about these features.

No Memory Effect

Memory effect is the problem that (it’s alleged) nickel cadmium rechargeable has whereby they hold less and less charge, depending on use. For example, if a ni-cad battery is not fully discharged, the theory goes that the battery “remembers” that it’s got a smaller capacity for charge than the manufacturer intended.

This means, after charge–by-charger, the ni-cad battery will be less and less efficient.

More lighter

For example, a Li-ion 18V 3.0Ah Makita BL1830 battery is about 650 g, but a Ni-MH 18V 3.0Ah Bosch BAT026 is 1200 g, In the same voltage and capacity, the Ni-MH battery is nearly twice of the weight of the Li-ion battery.

This is great when you are using a cordless power tools above shoulder height for any length of time.

High energy density

The energy density of lithium-ion is typically twice that of the standard nickel-cadmium. There is potential for higher energy densities. The load characteristics are reasonably good and behave similarly to nickel-cadmium in terms of discharge. The high cell voltage of 3.6 volts allows battery pack designs with only one cell. Most of today’s mobile phones run on a single cell. A nickel-based pack would require three 1.2-volt cells connected in series.

Low Self-discharge rate:

A lithium-ion cell is that their rate of self-discharge is much lower than that of other rechargeable cells such as Ni-Cad and Ni-MH forms. You do not need to charge it again after a long time of use, this can save time when you have something urgent to do.

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How to calculate the number of cells in a Li-ion cordless power tool battery

In my last article, we know how to calculate cells in Li-ion laptop battery, and what a 18650 battery cell is. And, let learn How to calculate the number of cells in a Li-ion cordless power tool battery.

It is known that the Li-ion Cordless tool battery is also made by 18650 battery cell. So, it is very easy to calculate the number of cells in a Li-ion power tools.

For example, the Makita BL1830 Battery, it is a 18 V, 3000mAh battery. How many cells in it? Let’s calculate it.

To make the voltage to 18 V, it needs 5 series of 3.6 V cell, and to make capacity to 3000mAh, it needs 2 parallels of 1500mAh cell. So, the total of a 3000mAh Makita BL1830 battery is 5*2 = 10 cells.

But, some people may say, why not use a 3.6 V 3000mAh battery cell to build it? The reason is, power tools is heavy duty machine, it need much more power than the nomal laptop battery, so the density of the chemistry material is much more than laptop battery cell. It is hard to do it.

For Li-ion cordless tool batteries or notebook batteries, normally speaking, the higher capacity (mAh), the larger in size, and heavier in weight. Of course, more capacity means longer run time. A 1500mAh 18 V battery will run longer than the 3000mAh 18 V battery, but may not the running time.

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How to Calculate the Number of Cells in a Li-Ion Laptop Battery

You may find that most of laptop manufacturers will state how many cells in their Li-ion laptop battery, such as Dell, Sony, ACER and so on. Further more, many laptop battery reseller also say the number of cells of their Lithium-ion Laptop battery.

But, do you know to calculator the number of cells?

First of all, let’s know the inside of a Li-ion Laptop battery, it is made with outside plastic case or aluminum case, circuit boards, 18650 battery Cells. These are the main three parts of a Li-ion notebook battery.

So, what are 18650 battery cells?

It is called by its size, the diameter of it is 18.6 mm and the length is 65.2 mm, so the name is combined with the first two numbers of the diameter and length. This cell type is used in many laptop batteries, the Tesla Roadster, Tesla Model S, and LED flashlights.

Because most of the Li-ion notebook batteries are made with 18650 battery cells, and the capacity of it is 1800 mAh to 3400 mAh, this depends one what cells the battery use.

The voltage is 3.7 V, but, some battery cell manufacturer may say 3.6 V, in fact, 3.7 V and 3.6 V rechargeable is the same thing. Those are the mean/average voltages under load and it has to do with fully-charged-open-circuit-voltage. 10 years ago Li-ions were only charged up to 4.1 V and the mean/average voltage under load was 3.6 V. A few years later the manufacturers changed this to 4.2 V to increase the capacity of the batteries. Obviously this else made the mean voltage under load increase.

Even today, though it still makes sense to only charge your batteries (18650 for example) only up to 4.1 V as this drastically increases the life expectancy (number of cycles) of the batteries while only reducing the capacity by ~10%. Many hobby chargers allow doing this.

Now, we know what a Li-ion laptop battery is made of, and let’s calculate the number of cells.

As we know, series in physics makes current the same, but voltage will plug one by one, parallel makes the voltage the same, but Current will plug one by one.

For example, a 10.8 V 4400 mAh Lithium-ion laptop battery, in order to have the 10.8 V, it must take 3 battery cells, and in order to have 4400 mAh, it must have 2 cells. So, this needs 6 cells, and this is the number of the Li-Ion Laptop battery.

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5 different shapes of Bosch cordless power tools Battery

When using a Bosch cordless power tools, you need a battery. If you have many cordless drills, hammer, planer, circular saw, impact wrench and so on, the rage of the voltage is from 3.6V to 36V, so you have a large selection on Bosch tools. But, do you know how many battery shape of all Bosch cordless tools battery? Let me show you.

There are 5 shape of battery on batteries for Bosch cordless tools.

First, Bosch straight-shape battery packs.

In this range, you can find it in 3.6V, 10.8V tools.

For example,

3.6V straight-shape battery: Bosch 2 607 336 242 Battery
Bosch 2 607 336 242 Battery
10.8V straight-shape battery, Bosch 2 607 336 014 Battery

Second, Bosch Flat-shape battery packs

Here are the examples:

7.2V flat-shape battery: Bosch 2 607 335 033 battery
Bosch 2 607 335 033 battery
9.6V flat-shape battery: Bosch 2 607 335 037 battery

12V flat-shape battery: Bosch 2 607 335 055 battery

14V flat-shape battery: Bosch 2 607 335 210 battery
Bosch 2 607 335 210 battery
Third, Bosch bulb-shape battery pack, it just looks like a bulb.

7.2V bulb -shape battery: Bosch 2 607 300 001 battery
Bosch 2 607 300 001 battery
9.6V bulb -shape battery: Bosch 2 607 300 002 battery
Bosch 2 607 300 002 battery
12V bulb -shape battery: Bosch 2 607 335 021 battery
Bosch 2 607 335 021 battery
Fourthly, Bosch pod style battery pack

9.6V pod style battery: Bosch 2 607 335 540 battery
12V pod style battery: Bosch 2 607 335 262 battery
Bosch 2 607 335 262 battery
14.4V pod style battery: Bosch 2 607 335 694 battery
Bosch 2 607 335 694 battery
18V pod style battery: Bosch 2 607 335 266 battery
Bosch 2 607 335 266 battery
24V pod style battery: Bosch 2 607 335 510 battery
Bosch 2 607 335 510 battery
The last one is the Bosch slide-in battery packs, this type of battery is always Li-ion batteries.

14.4V slide-in battery: Bosch 2 607 336 224 battery
Bosch 2 607 336 224 battery
18V slide-in battery: Bosch 2 607 336 236 battery
Bosch 2 607 336 236 battery
24V slide-in battery: Bosch 2 607 335 216 battery
2 607 335 216 battery
36V slide-in battery: Bosch 2 607 336 002 battery
Bosch 2 607 336 002 battery

Now, you know the shape of the Bosch power tools battery, the next time when buying the battery, I suggest you to check the shape of your old battery, otherwise, you may buy the wrong one.

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10 tips on making the Ni-CD and Ni-MH rechargeable Cordless power tools run longer

If you want your cordless power tools to be durable use, you must know how to maintenance it. But, for tools used with Ni-CD or Ni-MH batteries, the main point is how to protect the battery and charger. in order to better protect the battery and charger, here are some particular attentions:
1. When in summer, the temperatures are high, long working hours make the battery to high temperatures, and even produce burst phenomenon, so, attention should be adapted to control the battery temperature.
2. After a battery is fully charged, the charger will be hot, so it is better to charger another battery after 10-15 minutes.
3. Because the Ni-CD and Ni-MH battery has the “Memory effect”, long-term improper charging and discharging will made the battery life shortened.
4. Batteries are chemical substances is prohibited hit the water, otherwise there is risk of a problem but will not be able to repair, to replace the battery, the old battery can only be scrapped。
5. Unplug the power of charger when there is no battery.
6. Charging the best in the room, the temperature is below 38 degrees is best.
7. Thunderstorms often occur in summer, when lightning and voltage instability, please do not charge the battery, because this will may the charger easy to burn.
8. Pay attention to the working environment, to avoid metal is sucked inside the motor magnetic motor, this will cause the motor stuck phenomenon.
9. Recharged the battery for every two months if not used, otherwise it may appear the phenomenon of cell necrosis.
10. Old batteries should appoint good collection and treatment, so as not to pollute the environment.

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DeWalt DCD710S2 12V 1.5AH Li-ion battery reviews

We provide the best Dewalt Battery which fits DCD710S2 cordless drill. When you buy Dewalt DCB120 Battery or Dewalt DCB121 Battery from us, you can be rest assured that you are receiving the best value and service for your money. This replacement Cordless Drill Battery is guaranteed to be brand new and fresh from our factory.

Product ID: TFDW090

Battery Type: Li-ion

Battery Voltage: 12V

Battery Capacity: 1500mAh

Battery Size: 90.75 x 64.45 x 45.30 mm

Fit Modes: DCD710S2, DCF610S2, DCF813S2, DCF815S2, DCK211S2, DCS310S1, DCT410S1

Compatible P/N: DCB120, DCB121

Battery Condition: Replacement Battery (Brand New)

Guaranteed: 30 Days Money Back, 1 year warranty!

Final Price Including VAT- UK and Irealnd Only!

Sale Price:
See details at

Here are some reviews about this replacement battery :

Received the battery in good packaging, grate value and quick delivery. After using it, I’m more satisfied with this purchase as the 1.5Ah DeWalt DCD710S2 Battery has a very good performance in my DeWalt DCD710S2 drill. I use this drill quite offen as it is Lightweight designed and I can hook the belt around my shoulder and carry it to my workplace with ease, and the battery is light and powerful.

I bought this battery because my original battery was running out of juice in the middle of a project, it is light and powerful, and easy to charge. I use this DeWalt drill a lot, as it gest into tight places that other drills can’t, so a good quality battery is very important. Great buy for the money!

I was worried about power and longevity when I bought this replacement battery, but not after using it. I love the light weight, compact size, and most importantly, it offers amazing power and excellent battery life. If someone is going to own just one spare battery, I would recommend this as the one to own.

I’m glad I bought it, powerful li-ion battery, works great. Now my drill can get in those tight spots easily again with it. long battery life.

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What can we do with spent batteries?

Today, batteries have become a common power source for many household and industrial applications.

There are two types of batteries: primary batteries (disposable batteries), which are designed to be used once and discarded. These are most commonly used in portable devices that have low current drain, used only intermittently, or well away from an alternative power source, such as in alarm and communication circuits where other electric power is only intermittently available. Common types of disposable batteries include zinc–carbon batteries and alkaline batteries.

And secondary batteries (rechargeable batteries), which are designed to be recharged and used for multiple times. Batteries of this type include lead–acid battery, nickel–cadmium (Ni-Cd), nickel metal hydride (Ni-MH), lithium-ion (Li-ion) and nickel–zinc (Ni-Zn).

Approximately 160 000 tonnes of consumer batteries, 190 000 tonnes of industrial batteries and 800 000 tonnes of vehicle batteries are sold in the EU every year, however, till 2002, half of the portable batteries sold in the EU were sent for final disposal in landfills or were incinerated, instead of being recycled.

Since several hundred thousand tonnes of industrial and portable batteries and accumulators are placed on the Community market every year, a wide range of metals are used, from mercury, lead and cadmium to nickel, copper, zinc, manganese and lithium.Collecting and recycling old batteries prevents these substances from getting into the environment and saves energy and natural resources.

Disposing of the waste from these products pollutes the atmosphere (in the case of incineration) and contaminates ground-cover and water (in the case of landfill or burial). Through appropriate rules it will be possible to reduce the environmental pollution from this waste. In addition, recycling the waste enables the recovery of some precious metals like nickel, cobalt and silver.

The most popular used batteries for power tools are Ni-cd, Ni-MH and Li-ion batteries. Usually lead-acid automotive batteries are recycled more readily than others (nearly 90% are recycled), but now, other types, such as alkaline and rechargeable mentioned before, can also be recycled, which will hep to reduce soil contamination and water pollution.

To ensure that a high proportion of spent batteries are recycled, the government must take whatever measures are needed (including economic instruments) to promote and maximize separate waste collections and prevent batteries being thrown away as unsorted municipal refuse. They have to make arrangements enabling end-users to discard spent batteries at collection points in their vicinity and have them taken back at no charge by the producers. Collection rates of at least 25% and 45% have to be reached by 26 September 2012 and 26 September 2016 respectively according to the directive in 2006.

As a minimum, treatment must include removal of all fluids and acids in EU. Batteries must be treated and stored (even if only temporarily) in sites with impermeable surfaces and weatherproof covering, or in suitable containers

To achieve this goal, it must be possible to remove batteries readily and safely. It is for Member States in EU to ensure that manufacturers design their appliances accordingly.
Also, Member States in EU have to ensure that, from 26 September 2009, batteries that have been collected are treated and recycled using the best available techniques. Recycling must exclude energy recovery. For example, a group named ‘Gravita ‘ in India is committed to the employment of environment friendly technologies in solutions for the used Lead-Acid Battery Recycling and Battery Manufacturing Industries, covering Secondary Lead Smelting, Lead Refining, Lead Alloying & Lead Oxides Manufacturing and Lead Pollution Control. They invent Air Filtration, Bag House Filtration equipments, both of them are important aspects of Battery Recycling procedure without which it is not feasible to carry on the process in Green concept.

As part of the program ‘Waste Electrical and Electronic Equipment ‘(WEEE), the directive in 1999 was only applied to batteries containing mercury, lead or cadmium, and excluded “bottom cells”. However, the 2006/66/EC directive aims to reduce the threats posed to human health and the environment by batteries that contain harmful materials. It represents a significant step up from the previous 1991 directive by making producers and importers fully responsible for the processing of waste batteries. Then in 2008, the new EU battery directive came into force is set to change how spent batteries are processed a national level.

End-users are to be informed in various ways:

1. Through campaigns covering, among other things, the potential effects on the environment and human health of the substances used in batteries and accumulators, and the collection and recycling arrangements at the end-users’ disposal;
2. Being directly informed by distributors that they can discard waste batteries and accumulators at sales points;
3. Visible, legible and indelible markings on batteries, accumulators and battery packs with the following information: the symbol of the crossed-out wheeled bin (in Annex II to the Directive); the capacity of the accumulator or the portable battery; the chemical symbols Hg, Cd and Pb if the batteries, accumulators or button cells contain over 0.0005% mercury, over 0.002% cadmium or over 0.004% lead. If the battery, accumulator or battery pack are too small, this information appears on the packaging.

Some municipalities will accept these batteries (as well as older, more toxic ones) at household hazardous waste facilities, from which they will most likely be sent elsewhere to be processed and recycled as components in new batteries.

Other options abound, such as the mail-order service, Battery Solutions website, which will recycle your spent batteries at a cost of 85 cents per pound. To find a company near you where you can drop off your old batteries for recycling, check out the comprehensive national database at the website. Meanwhile, the national chain, Batteries Plus, is happy to take back disposable batteries for recycling at any of its 255 retail stores coast-to-coast.
Especially, consumers should note that any old batteries they may find buried in their closets that were made before 1997—when Congress mandated a widespread mercury phase-out in batteries of all types—should most surely be recycled and not discarded with the trash, as they may contain as much as 10 times the mercury of newer versions.
Furthermore, they can find out where to drop off old rechargeable batteries (and even old cell phones) by calling RBRC’s hot-line or by visiting the online drop location finder at Also, most Radio Shack stores will take back rechargeable batteries and deliver them to RBRC free-of-charge. RBRC then processes the batteries via a thermal recovery technology that reclaims metals such as nickel, iron, cadmium, lead and cobalt, re-purposing them for use in new batteries.

Now we all know that the widespread use of batteries has created many environmental concerns, especially toxic metal pollution. Battery manufacture consumes resources and often involves hazardous chemicals. Used batteries also contribute to electronic waste. Some areas now have battery recycling services available to recover some of the materials from used batteries as we mentioned above. Batteries may be harmful or fatal if swallowed. Recycling or proper disposal prevents dangerous elements (such as lead, mercury, and cadmium) found in some types of batteries from entering the environment. The Battery Directive of the European Union has already come up with some requirements, in addition to requiring increased recycling of batteries, and promoting research on improved battery recycling methods. In accordance with this directive all batteries to be sold within the EU must be marked with the “collection symbol” (A crossed out wheeled bin). This must cover at least 3% of the surface of prismatic batteries and 1.5% of the surface of cylindrical batteries. All packaging must be marked likewise.

Except EU, in United States, Americans purchase nearly three billion batteries annually, and about 179,000 tons of those end up in landfills across the country. The Mercury-Containing and Rechargeable Battery Management Act of 1996 banned the sale of mercury-containing batteries, enacted uniform labeling requirements for rechargeable batteries, and required that rechargeable batteries be easily removable. California, and New York City prohibit the disposal of rechargeable batteries in solid waste, and along with Maine require recycling of cell phones. The rechargeable battery industry has nationwide recycling programs in the United States and Canada now, with drop off points at local retailers.

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What is UL 94 V0 plastic materials and how to verify it?

Q1: What is UL 94?

A1: UL 94 is a plastics flammability standard released by Underwriters Laboratories (UL) of the USA

The standard classifies plastics according to how they burn in various orientations and thicknesses. From lowest (least flame-retardant) to highest (most flame-retardant), the classifications are:

HB: Slow burning on a horizontal specimen; burning rate < 76 mm/min for thickness

V2: Burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed.

V1: Burning stops within 30 seconds on a vertical specimen; no drips allowed.

V0: Burning stops within 10 seconds on a vertical specimen; no drips allowed.

5VB: Burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole.

5VA: Burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may not develop a hole.

Tests are generally conducted on a 5″ x 1/2″ specimen of the minimum approved thickness. For 5VA and 5VB ratings, tests are performed on both bar and plaque specimens, and the flame ignition source is approximately five times as severe as that used for testing the other materials.

Q2: What is V0 flammability standard?

A2: If the plastic specimens reach V0 standard, they must:

Specimens must not burn with flaming combustion for more than 10 seconds after either test flame application.

Total flaming combustion time must not exceed 50 seconds for each set of 5 specimens.

Specimens must not burn with flaming or glowing combustion up to the specimen holding clamp.

Specimens must not drip flaming particles that ignite the cotton.

No specimen can have glowing combustion remain for longer than 30 seconds after removal of the test flame.

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What Is a Dewalt XRP Battery?

DeWalt XRP is a line of cordless ability resources that use high-capacity Dewlt Li-ion Battery. The DeWalt XRP line consists of cordless drill/drivers and cordless hammer drill. The XRP line was absolutely redesigned from its predecessors, for improved effectiveness, for a longer time run time involving costs and more time cordless power device battery everyday living. Most of the XRP batteries are backwards suitable with prior DeWalt drill batteries.

Batteries use while in the Dewalt XRP line:

The center of the DeWalt XRP line is really a new nano-phosphate components lithium-ion batteries. DeWalt statements that these new batteries have enhanced longevity could be re-charged nearly 2000 situations about the everyday living on the battery. The road incorporates 18-volt, fourteen.4-volt and 12-volt types.

Drill Transmission</br>
Every single product in the DeWalt XRP cordless drill provides a three-speed transmission (in which most other drills have a two-speed transmission). This more equipment lets the drilling motion to adapted properly for the endeavor at hand. Very first gear is for wood drilling with hole saws, second equipment for auger bits and 3rd gear for hammer drilling into concrete.

Drill Motor and Chuck</br>
The DeWalt XRP line of drills incorporates enhancements to your drill motors and chucks. The high-efficiency, frameless motors are built to have thirty % far more operate time, and so are linked to some self-tightening chuck that can help maintain the bits from slipping.


The DeWalt XRP line is intended with all steel gears and also a metallic gear scenario, that don’t just offers the drill greater longevity than former products, but it enables the drill to get increased dissipation of warmth. The drill motor brushes also are conveniently accessible for swift substitute.


The DeWalt XRP line is built to ensure the drill has greater balance, in addition to a cushioned ergonomic grip to assist cut down operator exhaustion. Every single XRP drill also incorporates an LED get the job done gentle to illuminate the function surface area.

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How to prolong lithium-based batteries

Simple Guidelines

* Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep-one.

Recharging a partially charged lithium-ion battery does not cause harm because there is no memory effect (in this respect, lithium-ion differs from nickel-based batteries). Short battery life in a laptop is mainly caused by heat rather than charge / discharge patterns.

* Batteries with fuel gauge (laptops) should be calibrated by applying a deliberate full discharge once every 30 charges. Running the battery pack down in the device would do. If ignored, the fuel gauge will become increasingly less accurate and in some cases cut off the device prematurely.

* Keep the lithium-ion battery cool. Avoid keeping it in a hot car cabin. For prolonged storage, keep the battery at a 40% charge level.

* Consider removing the battery from a laptop when running on fixed power. Some laptop manufacturers also concern about dust and moisture accumulating inside the battery casing.

* Avoid purchasing spare lithium-ion batteries for later use. Observe manufacturing dates. Do not buy old stock, even if sold at clearance price.

* If you have a spare lithium-ion battery, use one to the fullest and keep the other one cool by placing it in the refrigerator. Do not freeze the battery. For best results, store the battery at 40% state-of-charge.

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