This demonstration guide answers one field question about a battery charged in a closed cab next to a spark source. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with charger location and vent path. That reading separates a battery charged in a closed cab next to a spark source from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the battery vent as the primary path. If it is in spec, do not replace the battery vent just to complete a parts list.
Repair the failed system
The usual correction is the battery vent, installed to the documented spec for this complaint.
A demonstration shop records the finding so the next technician is not repeating a guess about a battery charged in a closed cab next to a spark source.
Stop before you make it worse
Do not boosting a battery while the cab heater is on. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the battery vent is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.