You can modify a cheap PC power supply into a charger good for about 15A or so.
13.8 V / 15 A from a PC Power Supply
Also include a backflow prevention diode, output voltage adjustment (tweak for about 14.4v at the battery) and a current limit circuit. If you like, use a circuit to automatically start a timer when the voltage rises above 14.3v and drop the output voltage to 13.8v after a few hours.
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When it comes to suck, squeeze, bang, blow,
The objective is to get the most bang for the buck,
To get the fuel economy up.
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