Originally posted by Bill Wakeley Jr.
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The plugs in your Kia :
The power outlet is designed to provide power for mobile telephones or other ... Only use 12V electric accessories which are less than 10A in electric capacity.
(That is better than most other automotive power ports I have checked)
A typical deep cycle marine battery is 120 amp-hr, 12V nominal. If you consistently drain it below 50% you are damaging the plates.
You can do a lot of charges of 3S 2200 mah packs from that, or a few charges of 12S 5000 mah.
Your car battery is lower capacity and is made for short burst current, not deep discharge, so it will give far fewer charges without being damaged.
Connecting the charger directly to the battery is usually preferred, because any length of wire acts as a resistor at high current and you can find your charge rate limited by the resulting voltage drop.
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