Is it possible to use a "normal" 300W PC power supply to recharge a
12v 7ah lead acid battery. If so, I need some help with the interface between the 300w power supply and the + and - terminals of the battery. Thanks snipped-for-privacy@earthlink.net
No (or perhaps "not easily"). You typically require 14.4 volts or so to charge a 12 volt lead-acid battery.
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You can buy a trickle charger for a few tens of dollars, and get it done properly. The PC PS will cutout when it gets an overvoltage, so it probably won't get up to 14.4VDC.
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