The PB2 RED with Charger is a wall charger designed by Xtar to charge, refresh, and activate rechargeable Li-Ion batteries. It is both a battery charger and a refresh function that can revive heavily discharged batteries. It is compatible with 3.6/3.7V Li-Ion batteries and is capable of delivering an output of 2.1A with a DC input of 5VDC. It is equipped with several charging modes, including constant voltage, constant current, and automatic current selection. It features USB and micro-USB connector ports and has an LED indicator to monitor the battery statuses. The PB2 has several safety features, including over-charge, over-discharge, and reverse polarity protection.