Bring your portable audio back to life with this high-capacity 7800mAh Li-Ion replacement battery, engineered for JBL Charge 4 and JBL Shockwave 4 Bluetooth speakers (Battery ID998, 3.7V). Designed to match the original battery specifications, this rechargeable power pack restores long playtime, dependable performance, and consistent power output so you can enjoy music longer without frequent charging.