TESIYI Safe, Powerful, Good performance 21700 BatteriesPlace of Origin: ChinaType: Li-ion BatteryCapacity: 4000mAhNominal Voltage: 3.7VDischarge Current: 40ARechargeable Time: over 1000 timesCharging time: 8 hours(standard charge)Cell Size: 21.1(D)mm*70.15(L)mmPackage Includes:2 * TESIYI 21700 Batteries2 * TESIYI Packaged BoxesAssociational 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.com2.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/B077X92RVS3.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 must 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.
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