Hi all, just looking for some recommendations on how to easily and effectively wire up some batteries. I've managed to score about 25 x 5Ah SLA batteries from a rack mount UPS, and I'd like to hook them together in parallel for my homemade 12V UPS. Their size and shape is similar to these here, with 6.3mm F2 terminals. Based on the space I have I was going to make packs of 5 batteries deep, and then put 4 or 5 of these packs side by side. Total load across all the packs is 20A / 240W tops. Previously I had used 7Ah batteries, and made a frame that held normal female spade crimp connectors in a 3D printed clip. The batteries could then be dropped in vertically and slot into the spades, with a daisy chain of cable between the crimps. Photos of this setup here and here These new batteries wont fit the same setup, and it's not space efficient to hand them from their terminals that way. With the space I have it's best if they are sitting normal/upright, or laying down on the side. I was thinking that with 5 batteries standing standing normally upright, their terminals will all be in a line. I could then use a busbar (eg 10x3mm aluminium) on top of the terminals to run the full length of the pack, and I just need a reliable fixing method. Options would drill the hole in the terminal slightly larger to fit an M3 bolt, or come up with some sort of clamping system that would slip under the terminal and lift it up against the busbar. Any thoughts or alternatives? I'm trying to avoid female spade crimps due to the tedious construction.