I followed a YouTube "Battery Hack" and Wasted 30 Days! (Desulfator)

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Previous video:    • The Best Protection for your Circuit ...  
555 Timer video:    • Electronic Basics #26: 555 Timer IC  

The video that was sent to me:    • Recover Dead Battery using 555 Timer IC  

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Websites which were shown/used during the video:
https://cdn.hackaday.io/files/2574111...
https://thesai.org/Downloads/Volume8N...

In this video we will be having a closer look at Desulfator circuits. A while ago a viewer sent me a link to a YouTube video in which someone made his own DIY design that he then used to "revive" and old lead acid battery. By doing that the original capacity of the battery got restored. That sounds too good to be true. So I made my own design, did tests for more than 30 days and ultimately decided whether all of this is fake or real. Let's get started!

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0:00 The Suspicious YouTube video
1:22 Intro
1:43 Desulfator Basics
2:59 My Car Battery is Done for
3:56 Testing my 2 Lead Acid Batteries
4:44 How does the Circuit from the Video function?
6:19 Testing the Circuit from the Video
7:03 My own (better) Desulfator Circuit
9:35 30 Day Test with my DIY Design
10:11 14 Day Test with Commercial Desulfators
10:44 Verdict