1 BAD CELL 15.2v 8ah 121.6wh Battery Module with BMS 4 cells
These modules have 4x 8ah cells inside in 4s1p configuration. We tested a lot of these packs and they were between 80-90% capacity at 0.2c discharge rate. These packs in particular have 1 bad cell in them. The BMS works but the cells are out of balance because of that 1 bad cell. You can carefully use a solder sucker tool to remove the cells and make sure you don't short the cells when doing that. Keep the packs at an angle so the solder doesn't melt towards the next cell. We are selling these for just $1.50 per cell for 8ah cells that are mostly testing between 80-90% capacity. The BMS is a bonus. And if you can rebalance the pack and get it to work again that is an even greater bonus. All cells are guaranteed to have voltage as we tested every pack. The 2nd photo shows the BMS. The tabs are just soldered in place.
These are nice, compact, and clean modules that were originally likely used in backup lighting systems.
We tested the BMS at 5a charge and discharge.
Module fully charged - 16.8 (4.2v per cell)
Module fully discharged - 11.2v (2.8v per cell)
Pack dimensions - 4.25" x 4.25" x 2.25"