Electronics > Projects, Designs, and Technical Stuff
Re-sealing SLA batteries
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drummerdimitri:
I've watched multiple YouTube tutorials on refilling UPS SLA batteries with distilled water and using a de-sulfator, I was able to restore a battery's capacity from 2 Ah to 7 Ah.

The only issue now is keeping it sealing as the pressure of the released gas while charging/discharging either pops the lids off or starts leaking when taped all around.

Has anyone here had any luck with this or should I just toss them out and get new batteries instead?
2N3055:

--- Quote from: drummerdimitri on May 02, 2020, 01:14:54 pm ---I've watched multiple YouTube tutorials on refilling UPS SLA batteries with distilled water and using a de-sulfator, I was able to restore a battery's capacity from 2 Ah to 7 Ah.

The only issue now is keeping it sealing as the pressure of the released gas while charging/discharging either pops the lids off or starts leaking when taped all around.

Has anyone here had any luck with this or should I just toss them out and get new batteries instead?

--- End quote ---
Throw them away. You cannot refill SLA, electrolite is in a gel format...
Gyro:
It makes an interesting experiment, but the dangers of leaking acid into your equipment are probably too high to risk.

Dead Lead Acid batteries have a significant scrap value too, which helps offset the cost of a new one(s) - it obviously helps if you have a few to trade.
drummerdimitri:
I will be keeping them on a flat surface outside of the UPS beneath a glass tray just in case they leak.

They have no scrap value where I live unfortunately!
NiHaoMike:
LiFePO4 batteries plus a BMS are a mostly drop in replacement for lead acid. LiFePO4 is often cheaper than SLA nowadays, especially for small packs.
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