ON THE WAY&reg;2Pcs 18650 2800mAh High Drain TCR Li-ion Rechargeable Battery Button Top- Dual AC Charger Included Plus Free Cellphone Stand Holder Battery: ON THE WAY2 x White 18650 PROTECTED 2800mAh Li-ion Rechargeable Battery-Button Top Nominal voltage: average 3.7V, cycle life: over 500 cycles, dimensions: 69.5mm (H) x 18mm (D) No memory effect, incorporates a small circuit board, typically on the bottom of the battery, to stop overcharging and short circuiting Charger: Generic 18650 Battery AC Charger for 2 x 18650 battery, quick charge with automatic constant current control prevents battery from overcharging, short circuit, and electronic shock Dual AC charger is compatible with two 18650 batteries simultaneously