sotxbill, There is a time to be born and a time to die. I have owned a BatteryMinder 12248 for over a year. It won't make a battery any better. It may prevent it from aging faster, but it won't make the battery any better. I put on a 5 year old delco on my charger for 3 months to desulfate. The GMC dealer told me my battery had a full charge, but failed the load test, sulfate problem. I also have a battery conductivity tester that will give me the actual cold cranking amps. I confirmed my battery was down on the CCA. The battery conductivity testor is what the dealer uses and in my opinion it's better than a load tester, which I also have. I have yet to see my cold cranking amps increase because of the BatteryMinder, which I use on about 20 batteries.
If your charger is boiling out the water, your charger isn't shutting off. The wrong charger will do harm also. Letting a battery sit over the winter and lose it charge isn't good either.
I rotate my BatteryMinder from battery to battery, as soon as it goes in to the float mode. Yet to see it boil a battery.
Check out the BatteryMinder 12248 and Midtronics Advanced Battery, Starter & Charging Tester BT300.
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