Fixing A Dead Makita Battery With A 20 Cent Part

A dead Makita power tool battery that refused to charge was diagnosed and repaired using the open-source PocketOBI tool, which queries the battery's internal data. One of the battery's NTC thermistors had failed open (infinite resistance), causing the charger to read a false -30°C temperature and refuse to start charging. A second battery showed a faulty 64°C reading. Both were fixed by replacing the failed thermistor — a 20-cent part — with the entire diagnosis-to-repair process taking about ten minutes.

Source: https://hackaday.com/2026/08/11/fixing-a-dead-makita-battery-with-a-20-cent-part. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.