I have been using Optima 6v batteries for many years - I have never had one go bad. You have to keep them charged.
If one ever gets discharged, you cannot charge/"revive" with a regular battery charger and/or regular charging technique.
Walmart used to sell Optima batteries. Amazon sells the 6v Optima battery.
As loathe as I am to disagree with you, Tim, but ... that's not entirely true. I let my Optima discharge all the way once and Jerry walked me through how to revive it with a 12 volt battery (or a second 6-volt) and my standard battery charger. If using a 12 volt, it needs to be one with opening cells (not a sealed "maintenance free"). Insert a heavy copper wire/cable into the third cell (thus making it a 6 volt ...) and connect the two batteries to the charger in parallel. All the charger sees is one low 6 volt battery and will charge the dead optima. Worked like a champ. Its been a few years so the experts can correct any of that if I remembered it wrong.
If you can deal with the purchase price, the Optima is an awesome battery. I got tired of buying 6 volt batteries. It's been so long, I forgot when I bought this one. My local Autozone carries them, as does our local NAPA. I think I had to order the 6 volt, though.
We avoid buying anything from Amazon ... :P
