Thanks to everyone who had information. Turned out moot, the batteries finally took a charge.
Good to hear it is working again, but I'd say you'd be fine. You can get both Gel and AGM SLA batteries in larger capacities, though I can't recall one that'd fit in the QB1+. I have in the past made larger cases to accommodate bigger cells, though I also often used a separate (ie faster) charger in these cases. This also allows me to swap (cheap) SLA batteries without needing more than one battery back, and charge them externally.
The changes in automotive batteries people are talking about are calcium lead acid batteries. This is not relevant to AGM/Gel SLAs.
It may take it quite a bit longer to charge with the original charger, though.
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