use for Bluetooth speaker this battery is orginal 2600 mah 3.6 V pack of five u can buy separate also battery quality like very genuine no fake bttries there is also inside the chips price is fix no bargain these battery are expensive long lasting and rechargeable Lot of rechargeable lion-ion battery packs. These are ideal for various electronic devices and projects requiring a reliable power source. Ensure compatibility with your device before purchase.