12V, High Current ATX Power Supply Mod, Part 3

I ran some tests using the 12V lead-acid battery I pulled out of my motorcycle for the winter, and I’m only able to charge at a disappointing 1.5 amps, at which point the power supply is down to 10.07V, just above the charger’s low voltage cut-off of 10V. So, I either did something wrong, or I missed something. I’m not sure what I’m going to do about it at this point. At least I can charge though, if just at a very slow rate.

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