What do the flashing lights mean on the charging tray?

Solid Red Lights – battery is charging

Solid Green Lights – battery is completely charged

Flashing Red Lights – either bad batteries or a defective multi-unit charging tray

Please check the batteries in a couple different slots on the multi-unit charging tray or a couple different charging trays. If you keep getting flashing red lights with the same battery, the battery is bad. If you try a few different batteries in the same slot on the multi-unit charging tray or single charging tray and it always blinks reds, you might have a bad multi-unit charging tray or single charging tray.