Thread: AGM battery top-up?

I dont think they can be rejuvinated as the one I have is sealed.
Having said that it may be possible to fill with a battery rejuvinator solution using a syringe, but would be time consuming and may not get a result.
ASFAIK they are absorbed glass matt so flooding the battery may not help as it would have to be absorbed into the glass matt. This is what makes them unique and safe in rollovers and positioning.

Cheers mate, yep I have prised off the top seal so now I can refill mine via the small valve holes! But as I mentioned not sure with what. Reading about it it seems dist water would be allright as the "mat" just means it's a mat of fibres soaked in 'stuff'. That's why I just ask - is it just dist water I should use? I presume so...

Hi davros, I would recommend you use extreme caution with regards to trying to fill an AGM battery.

With AGM type batteries, unlike a flooded wet cell battery where you simply top up the electrolyte with water, an AGM is usually damaged beyond repair once the electrolyte either dries out or leaks.

In an AGM, the electrolyte is suspended between the the glass mat and is in a gel form. Just adding water will not improve the battery’s performance and you risk the water becoming contaminated once its inside the battery and this could make the water conduct to the point that you could actually short the battery out and could even cause it to explode if the battery still has a charge.

Is it gel? Here

VRLA battery - Wikipedia, the free encyclopedia

a description puts gel and agm batteries in different categories...