JBL EON One Compact Battery Charger With extra batteries, you're able to extend the performance time of your EON ONE Compact System and keep the party going all night. So you need one of the EON ONE Compact Battery Charger's that allow you to charge up to two EON One Compact lithium-ion rechargeable batteries at the one time. With only 3.5 hours charge time for a single battery, and 7 hours for two; you're sure to have enough juice for your next party. Convenient LEDs indicate the charging status as well.