Forum Discussion

profdant139's avatar
profdant139
Explorer II
Oct 27, 2016

Is there a real-world test of a battery's true capacity?

My two group 31 batteries are rated at 110 amp hours -- and I never discharge them past 12.1 volts, or 50 percent state of charge. So that means, I think, that I should be able to get 55 amp hours ou...
pianotuna's avatar
pianotuna
Nomad III
Oct 29, 2016
Hi profdant139,

No. Mex is saying use a temperature compensated hydrometer.

profdant139 wrote:

So are you saying that an ordinary hydrometer, which costs less than ten dollars US, can give an accurate state of charge? The thing looks so amateurish -- the plastic arrow wobbles around and eventually points to a color zone -- green for good, yellow for fair, red for bad. That can't be what you have in mind, is it??

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,240 PostsLatest Activity: Apr 26, 2025