Milwaukee M18 Battery Teardown: A Battle with 0402 Components
2025-04-17
This detailed blog post documents a multi-month reverse engineering project of discarded Milwaukee M18 batteries. The author faced numerous challenges, from disassembling the battery casing and identifying tiny components like Texas Instruments MSP430G2744 microcontroller and BQ76925 battery monitor IC, to meticulously mapping the circuit board and deciphering the communication protocol between the battery and charger. The author shares their findings, including the surprising lack of cell balancing and details of the 2000 baud communication protocol. This is a fascinating deep dive into hardware reverse engineering, perfect for those interested in the intricacies of battery technology and electronics.
Hardware
battery