How to test auxiliary batteries for amperage?

guess its a matter of moving 200lbs of batteries or a 40lb tester :) either way works

GordonThree wrote:
Hygrometer isn't going to read out damage to the plates.

Go to Advance / Autozone and rent their battery load tester. It's just a box with a big resistor and a meter, should be cheap / free with a deposit.

Or better yet, take the batteries to one of those places and ask them to test them. They will put them on a tester and run the test for you for free. Of course, they do this because they want to sell you a new battery, but not being able to do so because the problem is really elsewhere, but they are friendly and helpful none the less.

Hygrometer isn't going to read out damage to the plates.

Go to Advance / Autozone and rent their battery load tester. It's just a box with a big resistor and a meter, should be cheap / free with a deposit.

Capt. Obvious might be on to something there.

Just like testing a 12 volt battery. A giant resistor, a period of time to apply the load, and a way to read the voltage. Oh thats right, its called a load tester.

Inverter load, starter motor engine disabled.

Wluldn't an accurate hydrometer reading work?

Other than an inverter, I can't either.