How do I disable 2016 Prius 12V Battery?

Do you mean that you just want to disconnect the battery? Just do the same as if charging the battery (as per the Owner's Manual):



But I'm intrigued by this:

Amazing MPG for a PRIUS.

 

Basically you can just disconnect the -ve battery cable (the black one).
It's the top one in the picture in this link:
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Alternatively, depending where your car is stored while you are away, you could connect a battery conditioner (trickle charger) or a 12v solar panel.

 

If this is something you'll need to do semi-regularly, there are switches that can be installed, so that you just turn something 90 degrees, and the negative cable is disconnected from the battery. Google "battery disconnect switch". Here's one of the first hits I found:

Battery Disconnect Switches | Battery Cutoff Switches

 

have you tried disabling sks on your key fob?

 

Bottom wire, nearest one in the picture (and nearest to the front of the car), has a red cover over it (cover is open in the picture), leave that one alone, the top battery wire (connected to the other battery post) is exposed, that is the one to disconnect.

 

If you disconnect the battery, what is the result when you reconnect it? What settings are lost?

 

For sure:

1. Radio presets
2. Trip meters

Possible:

1. Auto up of one or more windows. You may need to "retrain" them: run them down while holding the switch, then all the way up while holding the switch, and continue to hold the switch, when it's up, for at least a couple of seconds more. That should fix it.

Sneaky:

1. I've noticed, for the next few start ups, an odd rev-up of the engine, for a few seconds. Seems like something is getting recalibrated.

That's all the specifics I can think of for third gen; fourth gen maybe has more?

 

When I had my battery changed out the only thing I lost is the time of day on the clock. Radio pre-sets, and trip meters were intact.

 

So the one thing I forgot, is the one thing that actually gets lost?

 

How long is the car unattended? Are the temps very low? My Prius is a 2012, still on original 12V battery, and I’ve left it a week or more without difficulty. I’m wondering if a fault is draining your battery excessively. Yes, SKS consumes power, but probably not enough to drain a AAA battery in a month. You’ve got a far larger battery than that.

 

The simplest solution is not to disconnect the battery (and lose radio presets, etc), since even when disconnected a lead-acid battery will self-discharge. Get a Battery Tender charger and clip that on to the battery terminals when you are away. This charger will keep a small trickle charge on the battery and won't overcharge it. About $25- $45 depending on the model (even the Junior will meet your needs) online. I have one that I use for my convertible from November to April, and have replaced the battery on that car once in 13 years.

 

See post #3

 

Typically you disconnect the negative (black) cable.

 

if you look closely with a flashlight, you will see + on one battery post, and - on the other.

and, the negative post/cable goes to a nut on the fender body.