General description The 2X Rechargeable 4 Slots Li-ion Battery Charger is designed for charging various lithium-ion batteries, including 10440, 14500, 16340, 16650, 14650, 18350, 18500, and 18650 models. This smart charger can charge two batteries simultaneously, making it a convenient choice for users, especially while traveling. The power adapter folds out easily for charging and storage. Technical specifications Product model: BH-042100-04U Product weight: approximately 212g Input voltage: DC 5V 1-2A Output voltage: DC 4.2V 1000mA Product size: approximately 90 x 30 x 122mm / 2.7 x 0.9 x 3.66 inches Other information Universal micro-USB port with suitable charging current (1A / 2A) DC 5V input safety voltage Features reverse polarity and short circuit protection Flame-retardant shell for perfect heat dissipation and high temperature resistance Charging method: TC-CC-CV with a soft start feature Battery recovery function to maximize battery life Charge time: approximately 3 hours