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

• FM-05: Fm 3 2

• root cause analysis
• tools needed
• step-by-step repair procedure
• diagrams
• exploded views
• post-repair checks

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