JBL Battery 200Keep the party going twice as long with JBL Battery 200 Even the best parties have to end sometime, but your JBL PartyBox Club 120 can keep the vibe going twice as long with this JBL Battery 200. When your rechargeable battery is running out of juice, it takes just seconds to pop a fresh battery into the slot on the back panel. Each battery has enough power for up to 12 hours of playtime, which means you could keep the party going for up to 24 hours.