High Charging battery 4000mAh Li-ion High Power 21700 Battery Cell with 12A Continuous Discharge for Electric tool

Shenzhen Doublepow Energy Technology CO., LTD., specializes in the R&D, manufacture, sales and service of various rechargeable battery, battery charger and consumer electrionics. Established in 2012, located in Shenzhen,China.

We are proud of our state of the art facility using advanced processing equipment and is approved by the ISO 9001:2008, which span a total of 10,000 square meters, we can turn out over 2,000,000 pcs batteries and 1,000,000 pcs battery chargers monthly production capacity. With professional R&D team, experienced workers and advanced equipments, we are determined to provide you high-quality products.

Our Products
1. Lithium ion Battery;
2. Ni-MH and Ni-CD,CR2,CR123A Universal Battery;
3. Button Cell Battery(Non-rechargeable);
4. Battery Pack and Other Recycle Rechargeable Batteries;
5. Universal and Multifunctional Battery Charger for 1.2V 3.2V 3.7V 9V Battery;
6. Other Consumer Electronic with Rechargeable Batteries, such as Colorful Fashion USB Mini Fan.

"Doublepow" brand is a professional rechargeable battery manufacturer, we design and manufacture a range of high-quality rechargeable batteries,battery charger and related products.

"Doublepow" products have been quite well-known in the domestic market and inside the industry, more and more consumer selected and use of our products, their evaluation and feedback are very positive, they can get a very enjoyable experience from the use of our products.

Compared to other brands, the most valuable asset of "Doublepow" is our team, we have the most professional and top designers who have been in the battery industry for many years, all they are experienced and famous people in this industry.

Our OEM/ODM team spares no effort to meet the needs of all our customers, whether it's project development, application solutions, or technical support, with customer needs as our top priority. 

All of our batteries has been tested strictly before leaving factory, to ensure that meet the CE, ROHS, UN38.3 and MSDS requirement,Continually expanding our technical ability, our BRAND has become synonymous with quality with most of our customers domestic and worldwide .Our management system is more than a set of process, it ensure products quality and delivery on time.

Rechargeable Battery,

Production Line Capacity ,12,000,000 Pcs / Month

Actual Units Produced (Previous Year) 

130,000,000 Pcs 

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● Battery: Two or more cells connected together
● Cell: An electrochemical system that converts chemical energy into electrical energy.
● Capacity: This is amount of energy a battery cell or battery pack actually provides. The higher the capacity the longer the equipment will run on battery power. Usually measured in Amp hours (Ah) or Milliamp hours (mAh).
● Battery Charge: This is the process of passing electricity into the battery pack so the pack can be used to provide power when the user is away from mains power
● Li-ion: Lithium Ion. This is one the newest battery types available. It can offer the same power as a Ni-MH battery in a smaller and lighter package. This type does not suffer from 'Memory Effect' but it is expensive to manufacture.
● Ni-Cd: Nickel Cadmium. This is one of the oldest battery technologies that are still in use. Usually found only in older equipment or applications that require a high power drain. Very prone to 'Memory Effect'.
● Ni-MH: Nickel Metal Hydride. This battery type has virtually replaced the Ni-Cd batteries. This type offers higher capacities, around 30% more than a Ni-Cd cell of the same physical size. This type is also reported to suffer less from 'Memory Effect'.
● Battery Float Voltage: A unit for measuring electrical pressure. All batteries provide DC (Direct Current) electricity. It is important to ensure that the equipment you are powering is being provided with the correct volt or else damage may occur.

● New battery pack must be fully charged before use.
● New battery pack needs to be fully charged and discharged (cycled) a few times before it can condition to full capacity.
● Rechargeable batteries undergo self-discharging when left unused. Always store a battery pack in a fully charged staged for storage.
● Fully drain and fully recharged your battery pack every few months.
● Don't short circuit terminal or store your battery pack with metal parts.
● Don't drop or mutilate the battery pack.
● Don't expose to moisture or water.
● It is normal to get warm when charging or normal use. If it is getting too hot, there may be a problem with the device and qualified personnel should check it.

● 100% brand new and original manufacturer compatible.
● Full 1 year warranty.
● All batteries are made with the high quality cells.
● A competitive price is our principle.
● Replacement battery that is as good or often better than the originals.
● Shopping with us is 100% secure guaranteed!