You cannot charge an Optima like a normal battery. Battery tenders will NOT charge them. I found the best way to charge one it to put it in series with a regular battery on a 30 amp charge for a few hours, then switch it to 10 amp. There are specific types of chargers for Optima type batteries, but if you don't have one my method is preferred... twocents Edit: I just read your post again, sounds like you tried it through another battery already, may have to charge it longer. One of mine sat for 3 years and I brought it back to life that way.

Last edited by Rhinodart; 08/09/23 10:45 AM.
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

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