VRLA or AGM battery in a UPS, chances of being able to recharge?

[ericmark]

It seems very slow, but it is starting to absorb more energy

the switching between the two charge rates is effectively pulsing the charge, which seems to be a regular method of reviving lead acid batteries. The worry is battery cell going short circuit, if that happens then charge will go to 0.8 amp, which would over heat the battery if left.

A battery converts electrical energy into chemical energy, an action which does not produce heat, but if that electrical energy is not converted to chemical energy then only other option is it is converted to heat. With my mobility scooter one cell failed so the charger did not switch off, and as a result it baked the other cells, including the six cells in the good battery, being 24 volt there were two batteries.

Main problem with the mobility scooter is the batteries need to be on the scooter to charge them, with my e-bike I can remove the battery and take just the battery in doors to charge and leave bike in the back of my car, but with the mobility scooter had to take whole scooter in doors to charge. Poor design.

 

[Harry Bloomfield]

Main problem with the mobility scooter is the batteries need to be on the scooter to charge them, with my e-bike I can remove the battery and take just the battery in doors to charge and leave bike in the back of my car, but with the mobility scooter had to take whole scooter in doors to charge. Poor design.

Using the scooter's own charger - yes, but nothing to stop you using a normal 12v smart charger, to charge one or the two batteries at a time. You can do that on the scooter, or take the battery of the scooter.

I agree they don't make it easy to remove the batteries, but why would they need to, for most owners? Most owners simply park the scooter up and plug into the official charger. Mine is kept in the garden hut, which has power. It is unused, so I just plug it in to it's auto-charger every so often, just to make sure the batteries are fully topped up.

 

[ericmark]

Opening the battery case I can charge battery at a time, but one would have thought one could charge batteries off scooter without messing around opening the case.

 

[ericmark]

Well it seems to have finished charging

I will replace the battery and test it, but I think the way it charged up, likely will have a reduced capacity.

 

[ericmark]

Well seems now fully charged

next is to put a load on the battery, but it seems to have recovered.