Hi popotia and I am surprised your batteries lasted as long as they have.
First off, you need “DRIVE” for at least 15 minutes every time you start the motor, just to replace the amount of battery energy it took to start the motor.
NOTE, that is “DRIVE” for 15 minutes. Just idling is next to useless as the alternator is only just producing enough power to maintain the vehicle’s electrics while idling.
You need to drive the vehicle for 15 minutes so the alternator is turning at a much high rate, which will allow it to produce more energy than the vehicle’s electrics need and this additional energy will then be used to charge the battery.
Now add to the amount of energy needed to be replaced every time you start with the amount of energy that your batteries loose while they are not used for long periods of time. This is known as what a battery self-discharges, and in your case, you really needed to drive for a good hour or more, every time your started your motor.
I would have a guess and say your batteries are stuffed.
If you replace them, the new batteries will end up the same way, but, if your vehicle is parked inside near a mains power supply, you should get yourself a small, multi stage battery charger and keep your batteries fully charged during those long periods when not in use.
If your vehicle is parked outside, you could fit a solar panel in one of the windows that faces south, so it will pickup sunlight for a few hours each day.
You could use up to a 20w solar panel and you would not need a solar regulator. You could simply connect it to the batteries.


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