MELASTA 4PCS 18650 Batteries Charger 3.7V 2600MAH LI-ION Rechargeable Battery for DIY Fan Flashlight Power Bank Portable Speaker Battery High Power: 2600MAH 3.7V li-ion rechargeable battery. Li-ion technology : enables convenient charging at any time, no cell memory effect. Compatible with: fan, flashlight, power bank, portable speaker, power tool battery, and more DIY DESIGN! Advanced integrated overcharge & discharge protection circuits, provide a safer condition. Warranty: 35- DAY return policy and 1 Year warranty.