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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / February 2008Charging battery . . .
When charging a dead battery in a car -- do I need to disconnect the positive and negative terminals and then connect the charging clamps to the battery? I have been doing that so there would be no chance of harming the cars computer -- but maybe that's not necessary? Also, on a car with a computer, would any harm be done to the computer if connecting the charger to it and then using the "start" function selection which would put a much larger charge into the battery for a shorter period of just the starting time? What general precautions are there when jumping or charging a battery so as to not damage the car's computer? Thanks Gene >When charging a dead battery in a car -- do I need to disconnect the >positive and negative terminals and then connect the charging clamps to the >battery? I have been doing that so there would be no chance of harming the >cars computer -- but maybe that's not necessary? It isn't necessary, but it doesn't harm anything to do it either. Your call > Also, on a car with a >computer, would any harm be done to the computer if connecting the charger >to it and then using the "start" function selection which would put a much >larger charge into the battery for a shorter period of just the starting >time? You should be OK if you have a recent *smart charger* > What general precautions are there when jumping or charging a battery >so as to not damage the car's computer? Thanks Gene Get a good charger. Spend the money. >When charging a dead battery in a car -- do I need to disconnect the >positive and negative terminals and then connect the charging clamps to the >battery? I have been doing that so there would be no chance of harming the >cars computer -- but maybe that's not necessary? It isn't necessary, but it doesn't harm anything to do it either. Your call > Also, on a car with a >computer, would any harm be done to the computer if connecting the charger >to it and then using the "start" function selection which would put a much >larger charge into the battery for a shorter period of just the starting >time? You should be OK if you have a recent *smart charger* > What general precautions are there when jumping or charging a battery >so as to not damage the car's computer? Thanks Gene Get a good charger. Spend the money. > When charging a dead battery in a car -- do I need to disconnect the > positive and negative terminals and then connect the charging clamps to [quoted text clipped - 6 lines] > or charging a battery so as to not damage the car's computer? Thanks > Gene You are always safer if you remove one of the terminals. You may get away with no problems a lot of times, but -if you are going to charge or jump start a car - why not take off the terminal connectors, be sure terminals and cable connections are really clean, and after the battery is back up to par-= then replace them. > > When charging a dead battery in a car -- do I need to disconnect the > > positive and negative terminals and then connect the charging clamps to [quoted text clipped - 13 lines] > cable connections are really clean, and after the battery is back up to > par-= then replace them. You propose jump starting a car with the battery disconnected? >> > When charging a dead battery in a car -- do I need to disconnect the >> > positive and negative terminals and then connect the charging clamps to [quoted text clipped - 19 lines] > > You propose jump starting a car with the battery disconnected? No, of course not...Sorry..my bad >> > When charging a dead battery in a car -- do I need to disconnect the >> > positive and negative terminals and then connect the charging clamps to [quoted text clipped - 13 lines] >> cable connections are really clean, and after the battery is back up to >> par-= then replace them. >You propose jump starting a car with the battery disconnected? Connect the charger to the battery directly. Disconnnect the charger and reconnect the battery after it is charged. These precautions aren't necessary on any car made after about 1980. ECU engineers figured out how to protect them from voltage spikes. >When charging a dead battery in a car -- do I need to disconnect the >positive and negative terminals and then connect the charging clamps to the [quoted text clipped - 5 lines] >time? What general precautions are there when jumping or charging a battery >so as to not damage the car's computer? Thanks Gene Really no need to unhook the battery though it won't hurt anything to do so. I avoid using the start function unless I just have to go right now and have a dead battery. I've never heard of anyone having a problem caused by this though... Steve B. |
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