bac-hardware/eps/battery-contact/18650-2s2p/README.md

EPS Battery Contact PCB – 18650 2s2p

Subsystem: EPS
Status: ✅ Released

Latest Release:

• Version: v1r2
• Date: 2025-04-03
• KiCad: v9

Overview

This board contacts four 18650 lithium-ion cells in a 2s2p configuration. It connects to the EPS board from underneath using pins soldered into plated slots. A V-cut allows the board to snap apart, yielding one section for the Ym end and one for the Yp end of the pack.

It is mechanically constrained by inserts inside the EPS bay and is designed for ground-based and high-altitude balloon testing—not for spaceflight.

Specifications

• Dimensions: 68.7 mm × 33.75 mm (single)
• Layer Count: 2
• Panelization: Yes
  • Panel File: Included in release
  • Boards per Panel: 4
• Mounting: Pressed into EPS bay on battery pack ends
• Stacking: Not applicable

Files

• Design files: Located in the kicad9/ folder
• Schematics: PDF
• 3D Render:
  

Manufacturing

• Release: eps-battery-contact-18650-2s2p-v1r2
• BOM: Included
• Instruction:
  • Ordering: Included (PCBWay)
  • Sourcing: Not Included
  • Assembly: Not Included

Notes

Recommended cell type: LG MJ1.
For experimental and prototyping use only.

License

CC BY-SA 4.0