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Re: Battery reserve, is my battery shot? Posted by pme [Email] (#1496) [Profile/Gallery] (more from pme) on Wed, 15 Nov 2023 11:55:58
In Reply to: Re: Battery reserve, is my battery shot?, TML [Profile/Gallery] , Wed, 15 Nov 2023 06:49:01 Members do not see ads below this line. - Help Keep This Site Online - Signup
In general, the alternator is designed to provide a consistent level of electrical power to the car when it is running as well as topping up the battery charge after starts. Sure in a pinch, a good long drive can replenish a dead battery to a point where it seems fully charged, but it is not as effective in fully replenishing from dead with a long slow charge.
A big variable in how efficiently the alternator can refresh a battery after the starting load (while meeting the significant power demand of the running car) is the positive battery cable condition. As discussed many times on this board, internal corrosion can have a major impact of the cable’s ability to perform under load and transmit the alternator’s output back to the battery. Most noticeable in slow or long cranks especially after short trips.
OP: Glad you seem to have figured out the root issue. Still may be worth a quick load test next time you pass an Autozone or similar since you don’t know the battery’s provenance.
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