Engege LiFeP04 Powersports Starting BatteryProduct Features: ? Flexible Connection ? our batteries can be used in either left or right side polarity applications. ? Longer Storage Life ? there is no need to float charge in the off season.up to 2,500 times cycle life?3-5years), 3 times of lead-acid battery.? Environmentally Friendly ? non-toxic, non-contamination, no hazardous chemicals and it can be recycled. ? Fast Charging ? can be fully charged in less than one and a half hour.? Maintenance Free? No Special Mounting Direction? Will Not Freeze or Boil Over ? Light Weight ? 1/3 weight of Lead-acid battery.? Wide Working Temperature Range (-20??+55?) ? Extremely cold and extremely hot weather will not affect its performance.? Safe and Reliable ? built-in BMS system to ensure balanced charging, no need for charger with balance function. Battery Remaining Capacity vs. Voltage