KE4AVB wrote:Not so weird if it just had badly sulficated plates. A lot of the time takes a desuficator that uses a high frequency impulses the break down this sulfication. Some battery maintainers contain this system as part of the maintainer; even some modern chargers have it too.
And I have save a several dead batteries (sitting several years fully discharge) with my 60 watt 12V solar panel.
True about using a desulfator.
I prefer the Battery MINDER, model 121177C as a trickle/float charger. (I buy them when on sale)It has a auto function that when a battery gets fully charged it goes into a desulfating mode. (flashing green light)
It has a push to select for desulfating.
I've restored some of the small Lawn tractors batteries that I thought was a complete goner, but usually I have to keep my fingers crossed and expect to replace the battery before long.
They do not seem to hold a static charge (eq not being used) as long as a good battery after finding them completely dead and then re-storing, but worth the effort since the battery was a goner anyway.
I also use some of the 60 watt area solar trickle chargers on some eq that I do not use very often.