Upgraded to 5 Pin for E bikes The previous version used a 4 pin battery connection If your e bike has a 4 pin interface don t worry A free base is included in the package for seamless compatibility Simply use the new 5 pin battery with the provided base Specifications BrandUNITPACKPOWERModelS039Batteries Capacity36V 20AHBattery CellLG4800mAhProtection Board20ASize365 90 90mmOperating Temperature 20 45°C Features 1 Small size lightweight easy to carry sufficient power long mileage long service life high quality battery core capacity guaranteed mileage 2 Anti overcharge protection over discharge protection short circuit protection balanced voltage 3 The battery inside plus PVC film waterproof black hard plastic shell 4 The indicator light shows the power of the battery and reminds charging the battery in time 5 Anti theft lock with a handle to facilitate home charging Package includes 1 x Battery1 x AC Adapter1 x Power Cable1 x Discharge Plug 2 x Keys1 x Screws