FWIW: I cut the plug off this 150W DC to AC power inverter and connected it directly to the battery via a 10A fuse. Then I permanently installed it behind the seats for easy access even while in flight.
I then took the plug and made a connection cable that attaches to my battery charger. When I want to charge the battery I connect the cable/plug to the 12v power port on the inverter. The 12v power port works without having to turn the switch on/off so it is about as fool proof as you can get. Besides being able to easily "trickle charge" the battery up to 10A, it provides a 12v DC power port, three 120v AC outlets for small devices and has a 5v USB charger all without having to turn the master switch on. The best part is that it looks very professional.
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