DeWalt DXAEC10CA Instruction Manual page 14

The LCD screen will show the following (12V icon and Li icon will light
solid, as well as the battery icon):
IMPORTANT: If the battery clamps are connected incorrectly with
regard to polarity, the LCD screen shows the following (the fault icon
will flash; the 12V icon, Li icon and the battery icon will light solid):
Remove the clamps and then reconnect the clamps properly.
3. After a few seconds, the charging process will start automatically.
The LCD screen will show the following (12V icon and Li icon will
light solid, as well as the battery icon; the charging current and
charging voltage will display alternatively for every 3 seconds):
If the charger is overheated, the charging process will automatically
terminate and the LCD screen will flash the overheat icon and the fault
icon. The 12V icon, Li icon and the battery icon light solid.
Disconnect the connections. Allow the charger to cool down for a
period before resuming charging.
4. When the battery is completely charged, the LCD Screen shows
the following (12V icon, Li icon, battery icon and FLO icon will
light solid):
5. When disconnecting the battery charger, unplug the
AC power cord, remove the clamps from the battery.
CAUTION: Please make sure you select Lithium Battery Charging
mode to charge a 12V lithium battery.
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