failure mode

FM-05: FM-05 THE BATTERY LOSES CHARGE RAPIDLY WHILE STORED AND DISCONNECTED

The battery loses charge rapidly while stored and disconnected, becoming unusable after a short cool, dry storage interval.

Diagnostic overview

The battery loses charge rapidly while stored and disconnected, becoming unusable after a short cool, dry storage interval.

Likely Root Causes

  • The sealed cells have high self-discharge or an internal leakage path
  • The pack was not actually full before storage
  • Storage was hot, wet, conductive, or near metal
  • The battery was left in a tool that drew standby current
  • The comparison interval or starting state was not controlled

Quick Checks

  1. The disconnected pack retains useful charge over a reasonable storage interval, or abnormal self-discharge is isolated to the sealed pack.

Repair Preview

1.

This is a preview of the troubleshooting guidance included in the full repair manual.

Common Fixes

  • Designated charger

Related symptoms

  • A fully charged pack becomes unusable after a short cool, dry storage interval even though it was not left in a tool or charger.

    A fully charged pack becomes unusable after a short cool, dry storage interval even 1. Fully charge the pack on a designated charger, remove it from both charger and tool,

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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