p2 how to reconditioning my UPS batteries, the two 55 Ah/20h car batteries from 2009
Channel: How to use Power tools
Date: 03/03/2019

the two 55 Ah/20h car batteries from 2009, that have been sitting float-charged at 13,2 V per battery (which is far too low) since 2009, didn't perform as well as I'd hoped they would. They had probably gotten fairly sulphated due to being stored at such a low voltage. In this video, I cover the steps I took to desulfate them and get their capacity up from about 240 usable Wh (About 10 Ah at 24 V) to almost around 600 usable Wh (25 Ah at 24 V).

25 Ah is about what you'd expect to get out of a cheap lead-acid car battery like this, since starter batteries like these are quite horrible at getting discharged quickly. They specify the capacity at a 20 hour rate for just this reason.

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