X2 Extended Version Main Features:
1. charge Li-ion/NiMH/NiCD batteries, including protected 20700/21700
2. AC and USB dual input ports
3. LCD display for charge percentage, voltage, current & charged volume
4. intelligently detect battery status and auto-select the best charging current
5. constant currrent: 0.5Ax2; 1Ax2; 2Ax1
6. recover over-discharged batteries

More at link: XTAR X2 Charger (Extended Version)_ShenZhen XTAR Electronics Co., Ltd