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@rokkuchan , it seems your PSU wasn't up to the task. The battery should have very little drain when connected to a PSU, if not what's the point.
Did you check at all times that your PSU had stable voltage around 13.6V? And that it's capable of supplying well over 20-30A at that stable voltage?
You can learn much more in one of the older DIY PSU thread that I contributed to.
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