To fix this problem, I made a timed duplex power outlet. I plug the timed outlet into a 120v outlet. Then, plug the battery charger into the duplex outlet attached to the timer. Finally, I set the timer to 20 minutes and walk away.
The parts list to make this is simple:
- One (1) double gang electrical box.
- One (1) GE 15305 In Wall Spring Wound 60 Minute Countdown Timer
- One (1) duplex outlet
- One (1) old power cable from a computer
- Extra electrical wires (black / white / green)
Making this is also simple.
Step 1: Assemble the parts
Step 1: Cut the extra electrical wires into 8-12 inch lengths. Strip 1/8" off of each end.
Step 2: Cut off the female end of the computer power cable and strip off 6-8 inches of the outside case. Then, strip 1/8" off the end of each conductor.
Step 3: Remove one of the knockouts in the back of the double gang electrical box and insert the cut end of the computer power cable into the box.
Step 4: Attach the black conductor from the power cable to the line connector on the timer switch. Attach the white and green conductors from the power cable to the appropriate connections on the duplex outlet.
Step 5: If the timer switch did not come with a conductor for the load, use the extra black wire from step one. Connect the black wire from the load connector on the timer switch to the positive power connector (gold or yellow) on the duplex outlet.
Step 6: Attach the timer switch and duplex outlet to the electrical box using the mounting screws that came with each device.
Step 7: Test with a nightlight and/or electrical tester.