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Old 06-22-2020, 11:18 PM   #9
Pete'sMH
Senior Member
 
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,883
THOR #6826
Quote:
Originally Posted by Beau388 View Post
Chemistry says the hotter the batteries the faster the reaction. With flooded and AGM lead acid batteries, the fully charged voltage varies with temperature. The standard used is 12.73 volts @ 25 C (77 F). With temps above 25 C, the fully charged voltage will be lower and for temps below 25 C the fully charged voltage will be higher. A three state charger will compensate for temperature. Better chargers actually monitor the battery temperature; cheaper ones assume the batteries are the same temperature as the charger.


I concur and I think you might be overthinking the whole thing. A variation of a few hundredths of a volt seems perfectly normal.
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