Mr Whippy
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| posted on 27/7/14 at 11:56 AM |
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charging 24v AGM mobility scooter batteries - is this normal??
Hi
Bit off topic but I have built a Toylander kids car which uses two 12v batteries wired up to give 24v
Last night I finally got the motors working on it and am very pleased it all worker perfectly first time though its a lot louder than I expected
Anyway, I'm having some concern about charging the batteries as its not behaving how I expected and they were quite expensive so may be being
super over nervously cautious about nothing whatsoever
I've got two new 50ah absorbed glass mat batteries and with them came a large charger as part of the deal/package, its fitted with a 3 pin xlr
connector so I bought a socket for this but have only wired the positive and negative wires, not sure what I'd wire the third pin too???
So the batteries were obviously not very low as together they came to 25 volts but I thought I'd give the charger a go and plug it in expecting
it to indicate its charged in a few minutes (LEDS) and went off got get my breakfast... When I came back it's still charging, the batteries are
slightly hissing and the positive terminals are a bit damp. The voltage was 27.5 volts, worried something is going wrong I disconnected the charger
and the hissing stopped and batteries now have a voltage of 26.2 so yeah they are now more charged.
1) My questions are, are they meant to hiss slightly while charging? I thought the batteries are sealed
2) Why are the + terminals getting damp, is it over charging them? Am I loosing electrolyte?
I'm probably making a mountain out a mole hill but just not sure what's normal with these types of batteries.
Thanks.
[Edited on 27/7/14 by Mr Whippy]
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MikeRJ
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| posted on 27/7/14 at 01:00 PM |
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Perfectly normal charge voltage for a 24v (nominal) battery. A sealed lead acid battery should have around 2.3 to 2.4v per cell applied to it during
the charging phase.
Having damp terminals is something to be concerned about; a sealed battery simply shouldn't be leaking. They have an internal pressure valve
that will relieve excessive internal pressure from e.g. severe overcharging, but this should normally stay sealed.
[Edited on 27/7/14 by MikeRJ]
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Mr Whippy
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| posted on 27/7/14 at 04:08 PM |
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thanks, I've been running the motors unloaded for a few hours now to take the battery charge down and then see if it charges back up normally.
Damp on the terminals and the slight hiss was a tad worrying and will see if that happens again
cheers
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