Maintaining Battery during dormancy

When off, the hybrid battery is isolated from the rest of the car.
They typically don’t lose much energy, but the older they are, the more prone to it.

there is a constant drain on the 12v, again, the older it is, the more likely to drain and sulphate.
In good health, it should last more than a few weeks, but becomes more risky as it ages.
A maintainer is always best, but disconnecting also works. But you may lose a few settings like radio stations or window memory, it’s inconsistent

 

I don't think there's a need to cycle that maintainer manually.

 

correct, it does all the switching itself. when not charging, it is monitoring charge level. you don't want to switch it off

 

All vehicles "burn" power when off. A Prius with no aftermarket gizmos has 15-25 ma of parasitic draw. That is 15 thousands of a amp. Many trucks have close to 50 ma of parasitic drain.

With a new 12v battery you might get 4 weeks before you can't get a Ready. With an 8 year old battery you might get 4 days. The truck has gone through 2 batteries in 8 years. I had a Prius 12v battery last 10 years as have others so its no surprise its dead after a week trip.

 

Allowing it to discharge dramatically reduces battery life. Great if you are helping Priuscamper.

 

That's what these new-fangled battery maintainers do. They're smart. Not an old-fashioned dumb 'trickle' charger, so no worries about over charging. Read the link on the NOCO1 you provided above. It's for the 12v battery only.

As far as the traction battery goes, on your 2010 or on my 2026, I've got no idea. It does lose charge, as @bisco said. Perhaps scouring the threads will give you an idea how long it can remain unattended. If it goes totally dead, I THINK there's no return.

 

If you have someone that could drive it for a few miles once a week would be good.