4 layers68.4 × 52.4 mm

Openbms
open-batt/openbms-hardware
OpenBMS - Open Source Battery Management System Hardware
220 parts4MIT
KiCad boards from 3 GitHub repositories tagged “li-po-battery”, the most starred first; open any of them in PCBKit.

open-batt/openbms-hardware
OpenBMS - Open Source Battery Management System Hardware

open-batt/openbms-test-bench-hardware
OpenBMS 600W resistive load (dissipative) hardware [schematic] [PCB layout]

Boardoza/Boardoza_MCP73831_Lithium_Battery_Charger_Breakout_Board
Compact single-cell Li-Ion/Li-Po battery charger module based on Microchip MCP73831 with USB Type-C input and adjustable charge current.