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The battery is low self discharge makes itself still maintain 75% of capacity after half year of non-use. The battery can be recharged up to 1000 times when fully or partially drained. Max discharge current is 2A. Pls check your need. Protection at anytime Automatically Protection against Overcharge, Over-discharge and Short-circuiting by Seiko Instruments Japan IC. Safety is First 4 Sets Internal Safety Protection and 3 Sets External Saftey Protection make sure you can use it without any worry. Do not worry when flashlight to be hot, TF-30L will provide automatically Protection against Overheated, Overcharge, Over-discharge and Short-circuiting. High Discharge, 3000mAh 3.7V Rechargeable Batteries,tuofeng insists on real capacity batteries always and with 12 months guaranty Energy:11.1 Wh, Charging voltage: 4.2V, Open Voltage: 3.6v~3.7V, Best 18650 lithium battery fitted for High drain flashlight, headlamp, bike light Over-current, Over-charge, Over-discharge, Over-temp, and DUAL short circuit protection for the 18650 lithium ion batteries. No memory effect; Fully covered with steel shell for preventing collision & impact; Size: Length: 2.74 inches (69.6 mm), diameter: 0.72 inches (18.4mm), weight 50g , Charger: Voltage: input1:100-240v ~ 50/60 Hz Specification: 18650, 14500, 18500, 17670, 17500, etc. Rechargeable Battery (3.6 V/3 .7v), full auto-stop, fully automatic intelligent charge The unit can charge several rechargeable lithium batteries. Type: TF-139 Input 1: AC 100-240v/50-60 Hz Input 2: DC 12v/400ma Output: DC 4 .5v/450ma Scope: Battery 18650, 14500, 18500, 17670, 17500,16340 During charging, the red and green lights alternate and, when filled, the green indicator lights up. Package include: 2x 3000mAh Rechargeable Batteries 1 x battery charger 1 x Protective box