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smartinezAug 4, 2025
What to do if the red BAD BATTERY LED is lit on my Schumacher SPI1 Battery Charger?
- CChristopher PachecoAug 4, 2025
If the red BAD BATTERY LED is lit, the battery may be sulfated. The charger is in desulfation mode, so continue charging for several hours. If this doesn't work, have the battery checked. Also, the battery may be overheated, so allow it to cool. The battery may be too large or have a short circuit, or the battery capacity could be too low, or the battery is too old. In these cases, have it checked or replaced. The battery also might not hold a charge due to a drain or because it's bad. Ensure there are no loads on the battery; if there are, remove them. If not, have the battery checked or replaced.
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