RAPPER Mobile Battery For Vivo Y21 (Vivo V2111) B-S1 {5000mAH}

1)Please drain all the power of the battery for the first 5 times before charging, and then take a full charge. Thus the battery can be reached the optimum effect of using. Please note that its full effect and longevity is only achieved after 3 to 5 complete charge and discharge circles because Li-on Battery become stable after few uses. 2)Do not expose the battery to the air for a long time without the package, if not use, please put the battery in a Airtight box. 3)Adopting the imported Li-on cell or polymer Li-on cells which are safe and have stable performance, high capability and Choose super compound plastic material for shell with UV rub-resistance treatment. 4)Do not expose the battery to liquid or subject to strong mechanical shocks.