Practically never used rechargeable battery charger. batteries included Can charge 2 batteries, either 1 on their own or 2 simultaneously. Integrated high-performance protected circuit automatically protects against overcharge, over discharge and short-circuiting Compatible with: Li-ion 18650, 18490, 18350, 17670, 17500, 16340 (RCR123), 14500, 10440 Ni-MH/Ni A, AA, AAA, AAAA