The battery has built-in 30A BMS which has better shockproof effect. Preventing over charge, over discharge, over current and short circuit, ensuring the long life expectancy. 60v ebike batteries packs Automtive grade cells,pur nickel sheet.Charger:84v 3A. Every Lithium battery have pass the QC appearance and function test before shipment. The Ebike battery charge cycle exceeds 1000 times, mothen 80% capacity after 800 cycles.Warranty:1 YearCertificate:ISO9001-2022, CE, UN38.3,MSDACharge temperature:-0-45Discharge temperature:-20-60.syi