MR Power Mobile Battery For original Samsung Galaxy S21 Ultra 5G (EB-BG998ABY) 5000mAh with 3 months warranty

New Lithium Ion batteries must be FULLY CHARGED and FULLY DISCHARGED 2 to 3 times, before being FULLY CONDITIONED. Please remember that a new Lithium-Ion battery's full performance and longevity is only achieved after 2 to 3 complete charge and discharge cycles. After you go through 2 to 3 cycles, you'll never have to condition your battery again!It Is Compulsory That After Receiving The Battery Put Into Your Phone And Plug Into Charge For 3-5 Hours Continuous Charge In Switch Off Mode For First Time Not Less Than And Not More Than That. All talk and standby times are approximate, depending upon carrier's network settings, signal strength, and features selected.