BESTSUN Soshine 3.7V 14500 900mAh Rechargable Li-Ion Batteries (4-count), with Battery Case Battery: 4 Packs 900mAh 14500 Lithium-ion rechargeable batteries. No memory effect ,can be recharged up to 1200 times when fully or partially drained. High recharge and discharge rate performance for you high powered device. Batteries come pre-charged and can be used immediately out of the package. Long-Lasting Performance: no memory effect. Keep a high stability and convenience than non-rechargeable battery.