sealed calcium batteries leak

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dogsbody

Very senior member
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Bristol
Wasn't sure where to stick this as it's sort relevant to Series, Fenders, Discos and laning so thought this was the best bet.

I deal with disabled equipment so with scooters and powerchairs I've spent years handling glass mat and gel batteries. You lot would know these as leisure or traction batteries. Recently a big scooter came into workshop fitted with aftermarket calcium batteries. Having checked that they were labelled as 'sealed' I treated them as glass mats and they charged and tested exactly as these. Then I left the rebuilt scooter standing up on it's rear end overnight. In the morning I had two puddles of acid burning through the padding I'd left under the scooter.
On investigation I found a little vent hole in the top of each battery and the acid dripping out.

So, for any of you that are liable to have your vehicles on anything other than four wheels can I strongly suggest that you avoid calcium batteries. Seemingly 'sealed' means that you don't have to top them up - it does not mean that the acid cannot escape if you turn the battery over.
 
All batteries have a vent hole, because in use, they pressurise. You should know this. Lots of vehicles have a drain tube attached to this vent, so that any acid expelled is channelled away from the car, to atmosphere.
 
All batteries have a vent hole, because in use, they pressurise. You should know this. Ub lots if vehicles they us a drain tube attached to this vent, so that any acid expelled is channeled away from the car, to atmosphere.

Yea but glass mat and gel batteries have vents that are too small for the acid to leak from. These were the first 'sealed' batteries that I've ever seen that have a vent large enough for acid to escape.
 
Hold on, guys, for a battery to be 'sealed' it has to have a pressure vent, not an open vent.

Also, no such thing as a 'Calcium' battery, Lead-Calcium, maybe, but we don't have any Calcium technology on its own.

So a battery is either wet, vented, by whatever means, or it is sealed VRLA or Valve Regulated Lead Acid. AGM is usually a sealed battery type, I've got a pair of 6V 220AH AGM batterieson our Mercedes conversion.

Peter
 
Wasn't sure where to stick this as it's sort relevant to Series, Fenders, Discos and laning so thought this was the best bet.

I deal with disabled equipment so with scooters and powerchairs I've spent years handling glass mat and gel batteries. You lot would know these as leisure or traction batteries. Recently a big scooter came into workshop fitted with aftermarket calcium batteries. Having checked that they were labelled as 'sealed' I treated them as glass mats and they charged and tested exactly as these. Then I left the rebuilt scooter standing up on it's rear end overnight. In the morning I had two puddles of acid burning through the padding I'd left under the scooter.
On investigation I found a little vent hole in the top of each battery and the acid dripping out.

So, for any of you that are liable to have your vehicles on anything other than four wheels can I strongly suggest that you avoid calcium batteries. Seemingly 'sealed' means that you don't have to top them up - it does not mean that the acid cannot escape if you turn the battery over.

All modern vehicle batteries are lead/calcium, the electrolyte is liquid and as you found they can leak when inverted. They may be semi sealed as they don't usually need topping up.
 
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