第一次24小时， 之后就3，4个小时就可以了，第一次充电的时候屏幕会闪一个东西，之后就没有了.下面是说明书里写的 4. Prior to first use, charge the battery for 24 hours. If necessary, the pump can be used during this period with the power cord only. The pump will display the message while the pump is in the initial charging mode. For best results, allow the pump to initially charge uninterrupted for 24 hours. After the 24-hour initial charge, subsequent charges will take approximately 4 hours. You should not need to remove the battery unless replacing. Tip: If the initial charging mode is interrupted (pump is unplugged/battery is used) or if the pump battery is removed and reinserted, the display message will flash, indicating the pump needs to complete the charging cycle (18-24 hours) prior to battery use.