I posted this in s.e.repair earlier but possibly thats the wrong n/g!
This is for a 24v (Ni-Cd originally) fairly powerful hammer drill. The original 2 batteries it came with are shot and Iv been through the replacing cells stage but have reached the end of the line with them! So many cells in series has not been a reliable format! Could I make up a reliable battery using 6x 18650 cells and two of these cheap in/out protection circuits (see below) powered out in series? I could arrange a switch to parallel them when charging if that may be necessary. There seems to be little information on how these circuits work.. or might react in a 24/26v connection. Worth a try? I doubt the current would peak at more than 3A even in a grind to a halt situation (even if you could hold onto the drill - but I havnt' measured). Otherwise the whole drill is for the bin! Its branded McKeller. Thanks C+
3S-8A-Li-ion-Lithium-Battery-18650-Charger-Protection-Board-10-8V-11-1-12V-12-6V eBay item number: 141739077302