72 overcharging
15V is not going to hurt a battery for some period but it will eventually--over a long period---cause it to use water, and corroded metal around it due to gassing and "puking." It WILL shorten battery life over a long period. If you look in any of the service manuals "there used to be" a chart showing some idea of temp change vs voltage output These charts are in the electrical section pertaining to alternator testing and service
The real danger of a cold battery is IF it has been allowed to run down enough that it will freeze---a good battery that is charged up will NOT freeze. You NEVER want to boost or charge a dead/ cold frozen battery.
This chart is out of the 72 service manual. Notice these are not outdoor temps, these are "near the VR" IE under the hood
15V is not going to hurt a battery for some period but it will eventually--over a long period---cause it to use water, and corroded metal around it due to gassing and "puking." It WILL shorten battery life over a long period. If you look in any of the service manuals "there used to be" a chart showing some idea of temp change vs voltage output These charts are in the electrical section pertaining to alternator testing and service
The real danger of a cold battery is IF it has been allowed to run down enough that it will freeze---a good battery that is charged up will NOT freeze. You NEVER want to boost or charge a dead/ cold frozen battery.
This chart is out of the 72 service manual. Notice these are not outdoor temps, these are "near the VR" IE under the hood