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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I doubt that you will recover the battery to a safe reliable state; the electrolyte is probably very concentrated so if you add water do it VERY VERY SLOWLY as there will be a potentially high temperature/pressure exothermic reaction. Scrapping the battery after modifying it may be a problem. Personally I'd scrap the battery due to the hazards of trying to recover it, and the present potential legal liabilities of helping in any way are prohibitive.
p.s. the way that law enforcement is going, it seems safer to say nothing at all rather than give warnings based on experience, in case the advice was incomplete or incorrect. Anyone know how we stand legally when giving comments here on 4HV? e.g. my comment above implies that water CAN be added, and my idea of 'very very slowly' is probably quite a lot slower than a teenagers! and how often should we 'remind' each other to use the correct protective equipment/clothing/.....
P.P.S. Earth is about 93 +/- 1.86 million miles from the sun .... where are you?
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Well, that advice goes against the 'usual' safety advice of 'ALWAYS ADD ELECTROLYTE TO WATER'. Doing it the 'other way round' risks at least a very exothermic reaction, at worst, an explosion.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I planned to make a mixture matching the PH of the battery, so bad things like that wouldn't happen. Seeing as the battery is already quite acidic and there's not much that can react that hasn't done so already, I feel safe about attempting this. The chance of an explosion seems pretty small.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I am doubtful that any acid actually left the battery, my understanding is that those cells vent O2/H2 when overcharged, so you only need to add water. As per the safety implications of adding water to acid, the acid in a battery should already be in aqueous form, so you (hopefully) do not have to worry about the heat of solution, and adding DI water to normal flooded cells is a pretty normal maintenance procedure. It should work fine for an AGM cell, since unlike gell cells the electrolyte is just absorbed in a fiberglass mat, not in gell form like a gell cell.
Did you smell the rotten egg smell come from your battery? I have seen a good number of overcharged AGM cells, but never seen one vent anything other than hydrogen/oxygen
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Freshening up VRLA batteries?
