4-slot fast battery charging for battery types: AAA / R03, AA / R6, 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18500, 18650, 18700 Suitable for use with Ni-MH, Ni-CD and Li-Ion batteries USB output port for practical powerbank function (5V / 2A) Li-ion recovery: zero-voltage battery activation Smart protection against short-circuit, overloading, overheating and reversed polarity Practical 4-level LED charging status indicators Works with any 5V standard USB charger or 5V/9V/12V USB quick-charger (not included)