Is it possible to get more life out of old 12v batteries?

This time I attempt to desulfate some of my old dead, and dying car and jet ski batteries.

To Desulfate these batteries I'm using this:

Noco Genius 5 Charger / Desulfator: https://amzn.to/3CSIQ1u

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00:00 Introduction
00:35 The Batteries
02:32 Repair Mode
04:28 First Test
05:51 Battery #2
09:34 Testing again after more time
11:00 Final Thoughts
13:33 Outro