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Originally posted by Ponderableyes, assuming 50 amp-hours and the wimpiest 5 amp headlights, a new fully charged battery would go ten hours until it's devoid of all charge. Certainly wouldn't start a car then. I'll stick with 4-5 hours as being the better guess. But 48?? No way.
you could have made the optimistic calculation: 50/5=10 xD
Originally posted by mikelom1995 -- does that count as old?
You must have an old car! Most car batteries nowadays can cope with full beam being left on for 48hrs and still start the car!
And now you are in my land.....so don't argue! Oh...... please do! 😏
And no, you're not supposed to run the house off it too! Ohms my God!
Originally posted by pawnhandlerIf it does have a bad cell, you may as well figure on replacing the battery real soon. Even if you give the battery a regular complete charge for several hours, as soon as the charger is disconnected that bad cell will immediately start draining the battery again even with everything else completely turned off.
It had a bad cell. It jumped, and we let the car run for a while, but when he turned it off -- that was that. Dead again. It was three years old. That doesn't seem like much.
In addition, the bad cell could also overload your car's charging system that normally keeps the battery charged up when the engine is running. This could cause the alternator to burn out, and you will then need to replace that too.
I think a reasonably decent battery should last at least 5 years.
Originally posted by mwmillerWhat if the alternators goosed ? maybe the battery is fine ?
If it does have a bad cell, you may as well figure on replacing the battery real soon. Even if you give the battery a regular complete charge for several hours, as soon as the charger is disconnected that bad cell will immediately start draining the battery again even with everything else completely turned off.
In addition, the bad cell could also ove ...[text shortened]... need to replace that too.
I think a reasonably decent battery should last at least 5 years.
