Using a battery with a bad cell is not a good idea.
Each cell has 2.1 volts in it.
So a fully charged battery has 12.6
with the engine running the alternator should put out around 13.5-15.
But if the battery has a bad cell. The battery only has 10.5 volts.
And that bad cell could be sucking every bit of power your alternator can produce.
Cars with computers made to run on 12.6 or more volts freak out when they only have 10.5 volts to go on.
So that could be making your brake light come on.
Or you could have real brake issues.
Thursday, December 25th, 2008 AT 12:39 AM