Thanks to everyone for their help! The information on this site is just incredible - so many smart, interesting people! I searched for Lew's test and found this:
"With Lifeline AGMs (assuming that you have your original batteries), you can do a simple voltage test to see if your batteries are still viable. No load test is really necessary.
After fully charging them (inverter shows to be in float charge), let them rest for an hour with no load on them (turn off your battery disconnect or remove the negative cable from the batter bank). Their resting, no load voltage should read 12.8-13.2VDC with a volt meter. If it is anything less, they have lost their capacity to hold a charge.
Lifelines will hold their voltage at this level with no load on them for periods up to 90 days or longer. If yours are showing a precipitous voltage drop after such a short time, they are gone and should be replaced.
Lew Farber...RVIA Certified Master Tech...ABYC Certified Master Marine Electrician
MASTER TECH ENERGY SYSTEMS, INC.
AM SOLAR ...MAGNUM…VICTRON ENERGY...LITHIUM & LIFELINE BATTERIES…MARINE REFRIGERATION
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We will try this test on the new AI. I'm keeping my fingers crossed!