INOX Test

I've got an old 80 amp wet cell DC Batt kicking around that I plan to put in the camper to just run lights (I'm sick of plugging into the car aux batt and the time taken to pack and unpack leads) and just run the fridge from the aux batt in the car.

The old DC generally holds about 12.3 volts after a charge, indicating about 70% charged, so she's not brilliant, but not stuffed. I'm going to see of INOX gives the old girl back some life.

Here's what I plan to do. Give the old DC a solid charge and then let it stand for 12 hours to let it settle and then take a voltage reading. Then I'll connect a thermo cooler I have (which draws a constant 4 amps) for 6 hours, turn it off, let the batt settle again and take another reading.

Then I'll add the INOX and go through the whole process again to see if it makes any difference, by comparing the comparitive readings.

Any suggestions (other than using an hydrometer because I don't have one and reckon the voltage reading will be a "constant" comparison).

Cheers'

Jim.