Any battery experts?
Pro
Joined: Sep 2009
Posts: 671
Likes: 10
From: Tulsa OK
Everyone on this Forum is an "expert". I don't believe you can get a valid voltage reading while on a charger, even if it is in "float mode". For accurate voltage measurement and comparisons, you should remove the charger and disconnect the negative cable to remove any parasite load. Then take the reading. The down side to this is the requirement of retraining a few of the computer systems after reconnecting the battery. If in doubt about the condition of your battery and you aren't sure about the age, a load test will be required.
Good Luck.
Okie
Good Luck.
Okie
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
No need to disconnect any battery cables to measure the battery voltage ... just measure across the + and - terminals on the battery.
Tech Contributor
Joined: May 2008
Posts: 3,100
Likes: 17
From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
The battery is fully charged at 12.8 volts. 13.6 volts will overcome the internal cell resistance of the battery, and keep it fully charged without excessive gassing or water loss from the electrolyte.
