lead-acid batteries for several products

I needed to do an urgent situation alternative a week ago. Unhealthy battery was: 12vdc, 4 amplifier hour gell cell All I possibly could find in your area was: 12vdc, 5 amplifier hour gell cell. The deep cycle batteries are similar aside from the amplifier hour rankings.
I do not *think* upgrading an amplifier hour ought to be an issue using this type of battery. Am I right?
A rise like this will not hurt, except to require 25% additional time to completely charge battery, and see that older backup supplies fully charge in 8-12hours, while more recent ones need as much as two times that point (appears to create batteries keep going longer). IOW a reduced charging current will not hurt, and it is only if you change to a much bigger battery that current may become lacking (vehicle batteries are ranked for 60 amplifier hrs).
I have bought lead-acidity batteries for many items (lantern, audio analyzer, security alarm), and also have been pleased with CS3 batteries. My security alarm uses Energy Sonic, but I'm not sure what that proves.
I purchase my UPSes at yard sales. They are the cheapo consumer toys that went dead and were left in the spare room a couple of more years. Batteries will always be toast.
Energy around here rarely is out for over a second. Whether it's out more than that, it's most likely destined to be out for over an inexpensive UPS could handle. Current product is lower to 1 minute run time. Should replace ups battery.