failure mode
FM-05: ONE COMPATIBLE PACK PRODUCES NO LIGHT WHILE OTHERS CHARGE
FM-05 ONE COMPATIBLE PACK PRODUCES NO LIGHT WHILE OTHERS CHARGE
Diagnostic overview
FM-05 ONE COMPATIBLE PACK PRODUCES NO LIGHT WHILE OTHERS CHARGE
Likely Root Causes
- The rejected battery pack is faulty or deeply discharged
- Pack contacts are dirty, worn, or electrically damaged
- Pack protection or temperature sensing is not allowing charge
- The pack is not actually compatible despite a similar fit
- The charger interface is marginal with that one pack
Quick Checks
- The DCB115 charges a known-good pack and the single refused pack is conclusively isolated, or the charger is routed to FM-01/service.
Repair Preview
Unplug the charger and remove the single rejected pack; inspect it for heat, cracks, swelling, leakage, wetness, burned terminals, or deformation and use FM-17 if any are present.
This is a preview of the troubleshooting guidance included in the full repair manual.
Related symptoms
One fully seated, physically sound compatible battery produces no red or yellow light, while the same DCB115 starts charging other known-good compatible packs from the same proven outlet.
One fully seated, physically sound compatible battery Unplug the charger and remove the single rejected pack; inspect it for
Included in the full manual
- root cause analysis
- tools needed
- step-by-step repair procedure
- diagrams
- exploded views
- post-repair checks
Public pages show a preview only. Purchase the full manual to download complete repair steps, diagrams, and verification procedures.