72 Volt 18650 Battery Modules ( 36v x 2 in series)

The UPS originally uses 10x12 volt sealed lead acid batteries. They have been replaced 18650 lithiums. Each module has its own battery management system. Each module is 36 volts which are then combine to in series to two banks of 72 volts per bank. (Note: 72v is oversized with BMS to handle the on-board UPS charging system otherwise a separate charge is needed). About the 36v LG pack with BMS: https://www.crypto-city.com/index.php/video/play/703/new-lg-36v-ebay-battery-pack-18650-simultaneous-charge-discharge-testing-fo/