failure mode
FM-14: FM-14 RUNTIME IS MUCH SHORTER THAN A MATCHED KNOWN-GOOD BATTERY
FM-14
Diagnostic overview
FM-14
Likely Root Causes
- Normal aging has reduced cell capacity
- A weak cell group reaches cutoff early
- High resistance wastes energy as heat
- The comparison used different charge, temperature, tool or task conditions
Quick Checks
- The original delivers comparable usable work under matched conditions, or repeatable reduced capacity is objectively proven.
Repair Preview
1.
This is a preview of the troubleshooting guidance included in the full repair manual.
Related symptoms
Runtime is much shorter than a matched known-good battery
FM-14 RUNTIME IS MUCH SHORTER THAN A MATCHED FM-20 OUTER HOUSING IS CRACKED, SPLIT, PUNCTURED, OR
After a normal full charge, the battery delivers usable power but substantially less work than a comparable known-good pack in the same tool, task and conditions.
After a normal full charge, the battery delivers usable power 1. Charge both packs to normal completion in a proven compatible charger and let
Included in the full manual
- root cause analysis
- tools needed
- step-by-step repair procedure
- diagrams
- exploded views
- post-repair checks
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