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Daox,
It seems to me that the Prius battery suffers from one or both of underuse and undercharging. I'm starting to think it's underuse. It's too bad that you can't get in to it to do an SG reading.
Compared to a regular car battery which gets a big drain every time it's started, The Prius battery gets a small draw for just a few seconds. Not enough exercise. The batteries that I discharge and recharge almost every day are healthy as lead horses.
Before you give up on it, a good bit of exercise might revive it like your Paseo's deep cycle. At least a good equalization charge would be in order.
If you do replace it are you going to go yellow top, stock or other aftermarket?
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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