ETpower&reg; 4PCS 3.7V 18650 3000mAh Rechargeable Lithium-Ion Battery with Smart Charger for LED Flashlights Camping Hiking Hunting Biking No memory effect, can be recharged up to 1000 times when fully or partially drained. Package include: 4pcs 18650 3000mah rechargeable battery+18650 charger. High energy density, long life battery. Charges 1 or 2 batteries simultaneously. With overcharge / discharge protection function that you can use it without worry. Durable in low and high temperature operations.Fit for camera, watch, calculators, flashlights, etc.