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My Batery Tender always goes to the green light stand by setting after a couple hours. What does your instructions say? IMO it should go to trickle.
Fred
Charge up your battery first with a real battery charger and then see if the "trickle" charger holds the full charge. If not, your battery is going south..... Your trickle charger isn't mean't to recharge a low battery, only to keep it fully charged while not in use.
OK, battery recomendations, if I need a new one? Red top?
Exide makes an AGM battery called the Orbital
-features a highly efficient design of spiral-wound plates combined with absorbed glass mat lead-
http://www.exideworld.com/products/...rbital_XCD.html
It's an excellent battery looks a bit more like your original Delco, and costs about the same as an Optima... I've had great service from mine even with extended periods of non-use.