I manage to fix this Ryobi 5Ah battery, by replacing the PCB,, circuit board.
Managed to get this new board at at a price of just $8ish.
Most non charging Ryobi batteries, does not need this, and can be relieved by charging them a little bit directly on the cells. As I show in this video :    • How to Fix Ryobi Batteries, with Simp...   or this one :    • Ryobi 18V Battery Not Charging  Fixi...  

[Affiliate Links]
Link CN Battery Charging Protection Circuit Board PCB for Ryobi 20V P108 RB18L40 Power Tools Battery : https://s.click.aliexpress.com/e/_DCd...

Link US Not the same as the one I used,, but might work,, but expensive : https://amzn.to/4a0Sj50
Link UK Very similarly to the one I installed, but a little different looking : https://amzn.to/3uDc2ao
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  / myplayhouse  
For 3$ a month, you get an extra weekly "What's UP" update video. Just for my Patrons. The Support I resave on patreon is all used on stuff to make interesting videos on YouTube.

My PlayHouse is a channel where i will show, what i am working on. I have this house, it is 168 Square Meters / 1808.3ft² and it is full, of halffinished projects.

I love working with heating, insulation, Servers, computers, Datacenter, green power, alternative energy, solar, wind and more. It all costs, but I'm trying to get the most out of my money, and my time.