Direct answer
A wrong result requires checking inputs, mode, calibration and output separately; a working control path can still be configured for the wrong state. For cordless-vacuum battery and charger, first cool to room temperature, use specified charger and compare low/max mode without head.
What this covers
- cordless-vacuum battery and charger with this exact failure state
- Diagnosis across battery versus charger, contacts, temperature, mode and powered attachment
- Customer-accessible observation, settings and external components
What it does not cover
- ×A displayed manufacturer error code with a different documented meaning
- ×Live electrical, sealed-system, internal battery-cell or gas repair
- ×A claim that every model exposes identical controls
Capture the exact failure state
ReversibleWrite down the selected mode, input conditions and the exact unexpected output. Expected behavior: accept charge and deliver expected runtime without heat or swelling.
Isolate the component boundary
ReversibleCool to room temperature, use specified charger and compare low/max mode without head. Use a known reference input or manufacturer test and compare the result. Boundary to separate: battery versus charger, contacts, temperature, mode and powered attachment.
Correct only the proven cause
ReversibleReplace the proven charger/battery through approved service. Correct the setting, calibration or component proven by that comparison.
Verify and stop safely
ReversibleRepeat with the reference and a normal real-world case. Stop for swelling, heat, odor, liquid or damaged contacts.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check first when cordless-vacuum battery and charger has this problem?+
Cool to room temperature, use specified charger and compare low/max mode without head.
Why not factory-reset immediately?+
The useful boundary is battery versus charger, contacts, temperature, mode and powered attachment. A reset can erase state without proving which side failed.
When should I stop troubleshooting?+
stop for swelling, heat, odor, liquid or damaged contacts.
Answer for the exact device and software version shown above.