CE Certified 3.7v 4000mAh 21700 Li-ion Battery
1.Top quality battery will be a big help when you're in emergency occasion.
2.If you really need 21700 Li-ion battery,you'll never regret to choose DOCA.
3.We have focused on R＆D in battery for more than 10 years and sell in EUR and America.
Color : blue
Shell material : nickel plated steel shell
Materials : steel hat by riveting process(fully covered steel)
Rating voltage : 3.7V (battery cell voltage: 3.6V)
Charge voltage : 4.2V±0.049V
Charging current : 1A,the Max is 2A
Standard charging time : 1A to full is about 5 hours
Fast charging time : 3.4A to full is about 2.5 hours
Max charge/discharge current : 3C
Discharge cut-off voltage : 2.50 ± 0.1V
Operating temperature : charging (0~45℃)/discharge (-20~60℃)
Dimensions : L70mm * D21mm
✔No memory effect : 3.7v 4000mAh rechargeable battery can be charged anytime.
✔Widely application : provide enough strong power for High-drain LED flashlights,headlamps,bike lights and all 21700 electronics.
✔Funtional : built-in dual short circuit protection.
Automatically protection against overheated,overcharge,over-discharge and short-circuiting.
2 * 21700 Li-ion battery
90 days free replacement。
24 month worry-free return warranty。
Lifetime friendly service.