A great way to supply power to chargers without lifting the bonet of your car! Or, for those that like charging packs in the car on the way to the field. Do not use more than 50W. (about 3,600mAh 3S @1C charge)
NOTE: Please ignore the labels that say 'Futaba' and 'JR'. For some reason the factory believed you can charge your transmitter with a 12V car power supply.
DO NOT CONNECT THIS TO YOUR TRANSMITTER! IT IS TO POWER BATTERY CHARGERS ONLY.
The label is helpful in inidcating polarity of the plugs, however.
I happened to have a heavy duty cigarette lighter plug and lead from an inverter that died on me years ago. I found it when rummaging around in a box of parts.
I just cut the plug off this adapter and joined the heavy duty one on with solder and heat shrink to insulate it.
I guess you could probably find more heavy duty cigarette lighter plug at electronics stores like radio shack.
It won't handle 12 amps. The spring at the back of the fuse melted into the plastic before a 5amp fuse blew. My guess is that as supplied it might handle 3amps.
I've cut the cigarette lighter plug off mine and fitted a heavier duty one.