BATTERY PARAMETERS: This high-power, high-capacity 52V 21.2Ah lithium battery delivers stable voltage for e-bikes, e-motorcycles, and scooters with motors ranging from 500W to 3000W. It serves as an excellent upgrade or replacement battery for most 72V control systems. BATTERY SIZE: 11.7*7.16 inches.( 30.4*18.7 cm) Before purchasing, please make sure this size fits your bike frame to avoid unnecessary returns. BMS PROTECTION: This lithium battery has a built-in 60A BMS, which has short-circuit, over-charge, over-discharge, over-current and temperature protection, the battery will be protected effectively. CYCLE LIFE: Over 1000 cycles Cycle Life Test: At 25°C, charging: 1C current, 0-100% SOC, 80% SOH. Assembled with imported Grade A cells, delivering exceptional power and extended range for your e-bike. APPLICATION: Electric bicycle, electric tricycle, e-scooter, e-skateboard, motor home, stored energy, power supply, electric lights, golf bus etc. AFTER-SALES SERVICE: we provide 2 years after-sales service for the e bike battery. If you have any problem with the ebike battery (installation/damage/unable to charge/not shipped), please contact us and we will help you solve the problem within 24 hours. Choose better quality replacement batteries for your e-bike We specialize in the development and research of e-bike batteries, using high-quality materials to provide riders with cost-effective e-bike batteries that meet all kinds of transportation needs of riders, even the desire for sports and outdoor exploration. The 52V 21.2Ah e-bike battery can provide a range of 50-100 kilometers when fully charged (depending on riding conditions, road conditions, rider's weight, etc.). The battery's long range allows you to reach farther places. Imported grade A cell The battery is made of high quality imported lithium-ion cells, combined with 60A BMS protection board, the battery cycle life of more than 1000 cycles.