Product Review

TESIYI Safe, Powerful, Good performance 21700 Batteries
Place of Origin: China
Type: Li-ion Battery
Capacity: 4000mAh
Nominal Voltage: 3.7V
Discharge Current: 40A
Rechargeable Time: over 1000 times
Charging time: 8 hours(standard charge)
Cell Size: 21.1(D)mm*70.15(L)mm

Package Includes:
2 * TESIYI 21700 Batteries
2 * TESIYI Packaged Boxes

Associational Question&Answer:
1.Are these authentic and how do I know? There are so many fakes out there.
✎Answer: Yes, 100% authentic TESIYI products selling in our store, you can check the code which on the battery, the link: www.tesiyi.com
2.What charger would you recommend to recharge these?
✎Answer: Use TESIYI E2/E2S charger will be much better. It has variable charge rates and works great. The link: https://www.amazon.com/dp/B077X92RVS
3.Can I use the button top battery charger to charge these flat top batteries?
✎Answer: Yes.
4.Can I use these in a head lamp or flashlight?
✎Answer: If your device requires 21700 batteries, it should be OK. These are great batteries and a great value.
5.Do these come precharged?
✎Answer: come with 25%~30% charge on them(ship easier)
6.Is it ce or ul certified?
✎Answer: CE and ROHS certified, tested by manufacturer.
7.How fast is the shipping for this?
✎Answer: FBA standard shipping 3~7 days; Expedited shipping 2~4 days if no delay.
(Any other questions, feel free contact us♥! TESIYI provides 100% smile&patient service~!)

Why Choose TESIYI:
1.Our company has 7 years experience in the line of Li-ion Batteries.
2.From raw materials to finished products, every process is tested and controlled professionally and strictly by our professional machines and person.
3.All of our products are approved ISO 9001:2008, GMP,FCC, CE, RoHS certificate.
4.Except for the Standard components, if you has special request for the components, we can customize for you.