... OCCL. OVER, EMPTY.Alarm functionsOVER, OCCL., Air, Empty, Low battery, control abnormal, no AC power supply, installation error, serious low ... , can run for 4h after being rechargedBatteryRechargeable lithium polymer battery, 7.4V, 1600mAhBattery rechargeWhen the pump is connected to the AC ... power supply, turn on the power and the battery will automatically recharge (about 8 ~14 hours to recharge ...