failure mode
FM-21: FM-21 A NEW INTERNAL RATTLE OR LOOSE MOVEMENT IS HEARD AFTER IMPACT
FM-21
Diagnostic overview
FM-21
Likely Root Causes
- An internal cell support or insulator broke
- A power rail or electronic assembly loosened
- A fastener or shell support failed internally
- Impact damaged a cell connection without opening the shell
Quick Checks
- The rattling pack is not charged or used and is transferred only for approved replacement or recycling.
Repair Preview
1.
This is a preview of the troubleshooting guidance included in the full repair manual.
Related symptoms
The cool dry battery shell appears closed, but a new loose rattle, clunk or shifting movement is heard inside after a drop or impact, with no swelling, liquid, smoke, odor or heat.
The cool dry battery shell appears closed, but a new loose 1. Remove the pack from every device and place it on a clear nonflammable surface.
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.