backup lithium battery pack 36v 48v 14ah 504wh 672wh for aventon pace 350 next-gen ebike

voltage: 36v/48v; capacity:14ah ; compitable motor power: 36v/48v 250w-500w; charge port: dc 5.5*2.1; continuous working current: 15a/25a;peak woking current: 80a net weight: approx 3.0kg; color: black; warranty:1 year; cell: 18650 3.6v 3500mah; assembling type: 10s4p/13s4p; cycle life: more than 800 times; power connector: anderson,xt-60,xt-90, or as customer's requests; if shelve a long time suggested that the battery voltage 36v-37v/48-49v, need for regular recharging (even if not use), must charge and discharge for three months one time.syi