Quote Originally Posted by IC2 View Post
I didn't think Optima batteries were AGM but a leak proof lead acid but needed a regulated charger - they WILL die - FAST - if they are overcharged though. Makes me wonder about my Powermaster alternator and my 2 year old Optima now as well, but so far the few hours that I have on this engine, the charge rate has been low. I do keep a Battery Minder on it though to maintain the charge. If I have to change to a standard battery, that presents a problem as I'll need a fully vented battery box.
We are in the same boat. My Optima says right on it - it's an AGM. Takes a charger with a AGM mode (for lack of another word) to bring it back. I also need to add a vent or change boxes. I think the battery has developed a memory and won't apparently charge past that point so your tender may be your saving grace. I too am less than pleased with the Powermaster name, too bad the assembler didn't just swap out that rectifier and say "hey, this one is bad". But to ship it with stripped connections...

Anyhow, it's water under the bridge. I'm going to see if I can get some credit for the battery, it's supposedly has a 3 year warranty... we'll see what happens.