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| Alum battery conversion. |
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| awemawson:
That sudden jump sounds like a shorted cell clearing it's short hence adding circa 2 volts to the total. From your figures I suspect another cell is also shorted. |
| DavidA:
Andrew, I think you may be right. The same kind of thing happened when I returned the battery to the charger for it's next cycle. It started at about 5 amp, then dropped suddenly after a couple of minutes to around 1 amp. It was holding there last time I looked. I'll persevere with it and see what happens. I have another battery ready to try out . Dave, |
| vtsteam:
Agree with the first thought, Andrew. But re. the second, I think these cells have a lower nominal voltage than lead acid ~ 1.7V/cell, vs 2V/cell for lead acid, from what I've noted on various peoples recorded trials. David -- you've got about 9 amp hours capacity recorded so far. A lot better than NO amp hours (as before), but I'm curious to see what the total capacity eventually works out to be. Great work, and thanks very much for publishing your actual data! |
| awemawson:
Dave, How goes the battery rejuvenating - not heard from you in a while :scratch: |
| DavidA:
Andrew, It's still ongoing. But the results don't look too promising. The battery that I provided data for above has just been recharged for the second time. as I only have one 5 Amp meter and it is tied up with charging another battery I will have to wait for couple of days before I can do a discharge test. I think the process will come down to 'does the battery have a damaged cell ?'. If so then unless one wants to start replacing cells (maybe from an old 'sacrificial' battery that has a couple of good cells left in it, the best route to take will be the one that leads you to the scrap yard to weigh in the lead. The electrolyte from the latest battery to be tried had a SG of 1.01. Almost pure water. No reaction at all to the bicarb. I'll update you when I have the new data. Dave. |
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