Features: On board battery protection circuit, anti overcharge, anti over discharge, anti overcurrent, anti short circuit and anti reverse connection, balanced charging, stable and safer operation. On board warning indicator, convenient to check whether the battery is connected reversely. Onboard 5V voltage stabilizing chip, which can output current continuously up to 5A, can give raspberry pie or Jetson Nano provide sufficient power. Provide complete supporting information manual. The parameters such as battery voltage, current, power and residual power can be measured through I2C interface communication,Real time detection of the working state of the module. Various interfaces are led out through wire, which is convenient for integration into trolley design and industrial control equipment. brand new and high quality Specifications: Battery voltage: 5V5A: 3.3V300mA Control interface: I2C Battery specification: 2600mAh 18650 lithium battery x3 (in series) Charging power supply: 12.6V2A Size: approx. 60x93mm Through hole diameter: 3.0mm Note: The UPS Module without 18650 Battery!!! Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x UPS Battery Backup (without 18650 Battery)