Reanimated old batteries (reanimated old bats ? :-) (lead-acid type) will only work for a few times and become worse every time you discharge them, that's my experience at least from owning and driving quite a lot of old cars, mopeds and a scoot, and it appears to be confirmed by technical publications I've read.
But if you've got some batteries that are not completely dead and reanimating them helps you through summer with no extra costs, the extra work can be worth it, especially in case of cashflow deficiencies haha...
Be prepared for winter though, battery condition really shows at low temps.