AGM's ,The First were US made Grey cased 110ah Marathons, then the same but made in Europe, then some large 230ah blue ones made in Spain, but they all split there sides as they shorted out, and finally the yellow 105ah Hawker types. Remember no wet acid inside so no dripping.
All were in matching strings of makes/types and ah to give 48v. Individually the lightest weighed 34kg.
Shame really if a better stronger case design and better internal clearance, i might have got another 5 years out of them.
But honestly constant checking each one nearly every day became a nightmare, and getting replacements was fast becoming expensive as the wheeler dealers got involved. Infact, a second hand AGM had become the same price as a new LUCAS 110ah ultra deep Marine/golf cart battery. With the wheeler dealer saying, "But New this AGM was over $350".
Anyways I am now working on the PLANTE lead acid battery.
Exide still make PLANTE but the plates are thin.
I am R&D a 2v multi plate cell battery at about 60kg at about 500ah each basically what one man/woman can lift on there own.
Polypropylene is readily available and can be made/moulded to any size and thickness, and the plate separators is a woven polypropylene material made into a sock. I am using rolled thick lead sheet that is roughed scratched surface, this roughing needs further research, for the correct oxide to form. There are a lot of variables here even with the thickness against supporting its own weight, case support without shorting out on any sediment etc etc. What i am trying to do is for a cross section of the case is to pack the multiple plates tight in the case with their socks on and therefore keep the Acid content minimum. Then there is expansion of the plates etc etc, anyway you get the jest .
It takes a minimum of 40 charges and 40 full discharges to build up sufficient oxides on the plate for the PLANTE battery to become efficient, so the more you use it the better the ah gets. Life of the battery is about 30 to 40 years dependant on the plate thickness.
And yes i have built some test multiplate cells, but for some reason every bloody time i get the positive and negative the wrong way around, although technically it shouldn't matter with a PLANTE as what you decide positive then charge and discharge with one being positive the cell will remain.
I will continue the works slowly in my retirement very soon.! Then i might thrash out another book 'How to Make a PLANTE battery' .