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Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I have one of these, I found it, I've opened the cap and there is 6 holes for whatever you put in here, water?/sulfuric acid? so i think there are 6 cells, how can I restore it, and recharge it?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I've never managed to restore one. Never tried squirting water in the holes, but I doubt it would help. On the bright side, they're pretty cheap if you want to just buy a new one.
Letting these batteries sit around flat is what kills them. If you do buy one, keep it charged and it'll last for years.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Looks like the typical bilge I'd expect on Instructables. I notice he never posted any measurements of capacity before and after, probably because it was 0 in both cases.
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
Steve Conner wrote ...
Looks like the typical bilge I'd expect on Instructables. I notice he never posted any measurements of capacity before and after, probably because it was 0 in both cases.
From the look of the comments it seems to work.
Not everything on instructables is total rubbish, there are some good how-to's on there
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
From the look of comments elsewhere on the Internet, putting special rocks on your hi-fi makes it sound better. Just sayin!
If you do try it, please measure the capacity before and after. Maybe time how long it can run a 12v lamp. Nothing like hard data.
I wouldn't expect it to work, because lead acid batteries die by the active ingredient, lead oxide, turning into useless lead sulphate. Or by the electrodes simply falling apart. Neither water nor acid will reverse those processes.
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Restoring a sealed 12v 7ah rechargeable battery?
