Battery holder for 18650 cells in a 2S3P configuration. By adding a 2S BMS, the pack can be charged with an 8.6 V DC adapter. Using six Samsung 35E cells, the total capacity can reach nearly 10,000 mAh. This design is based on an existing model but has been improved with added supports between the cells, holes for M4 screws to secure the holder, and a dedicated mount for the BMS.