USB DC 5V input, single slot independent charging and management system USB DC 5V input, single slot independent charging and management system Two charging current options (500mA /1000mA) LED indicators shows the charging status (25%, 50%, 75%, 100%) Have over-charge, over-discharge, short circuit and reverse battery detection protection, intelligent identification of bad batteries Compatible batteries: Li-ion / IMR , 18490, 18350, 17670, 17500, 16340 (RCR123), 14500, 10440