2026 Prius Plug in won't start

Not sure which battery maintainer you bought, but if it is the Noco Genius, the battery will recharge automatically, on and off every few days, as long as it is connected.

 

Ask it on the Gen 3 forum.

 

No

 

Again, if it is the Noco Genius, it could be left powered on and connected to the car indefinitely. No idea what you bought.

 

Those things never need a reset and shouldn’t be affected by a 12-V battery disconnect. If there is really a malfunction, no idea what the problem is.

 

Don’t keep the hatch open, though, as the light bulb will burn out. Those miniature tungsten bulbs have a life of only a few hundred hours. Use the 12 V service connector under the hood instead.

 

tungsten? lol. This is a Gen5!

I have a NOCO1 in the trunk, attached to the battery, just in case, or did I say that already?
My plan is to hook it up to a thin, flat extension cord. I do believe the weatherstripping will be okay when the hatch is closed.
The battery has a vent tube to the outside.

 

Giant leap in technology with the trunk light having been updated from tungsten to LED from Gen 4 to Gen 5!

 

Yes; you should hook-up the RV battery maintainer under the hood. There is a jump-point there. Hopefully you purchased a maintainer that's capable of outputting at least 2+ amps. Leaving the hood up won't draw extra current and will remind you to unplug the car before taking-off. A three mile drive isn't long enough for the 12V battery to recharge itself. I also wouldn't plug-in the car everyday either. You need to work all of the car's systems, in order to keep them healthy - you know what they say, use it or lose it. You'll also need to run your gasoline engine for at least 30 minutes about every 3-4 weeks. That should be easy in the winter months to generate heat for the cabin. You just need to do the same in the summer months too. Again, to keep everything lubed-up and running.
As for the 2014 Prius; I believe the manual failed to mention that your odometer needs to be in factory default mode, before beginning the instructions to reset the maintenance minder. I believe your odometer need to be set for total miles - NOT tripA or tripB. It's been a while since I've done one of those; but I believe you need to turn-on the car and press a button 3 times; holding it down on the third. Your display should start counting-down and you must keep that button down. If you release that button before the end of the count-down, it won't let you in to reset the maintenance minder.
I also believe there's a couple of Youtube videos on this issue too..

Good Luck....

 

Just wanted to show in attached image that in a 5th Gen Prius there's also a perfect slot available to route a charging cable under the hood between the rubber seal at the leading edge of the hood and the "tear duct" of the headlamp. I recall in my early attempts at leaving the hood up it seemed a warning kept appearing on the MID display that may not have gone away to my liking.

 

take it to a dealer while it is still under warranty

 

Leaving the car parked in “Ready” mode is a good idea. This charges the 12 volt battery. The only issue is that the car only charges the 12 volt up to about 50% and it will take longer than 1 hour if it is almost dead. I would leave it parked in Ready for 6 hours with the heater and headlights off. Also, odometer, etc. should start working normally once you drive the car.

 

Just get a Noco Genius. Leaving the car in READY mode is not practical. It drains about 1% SOC of the traction battery every five minutes or so. In 6 hours, the traction battery would fully drain, and the gas engine would kick in. Last but not least, as you said, it will only charge the 12-V battery to around 50% SOC, which is not enough.

 

1% SOC every 5 minutes seems to be a steep discharge curve for a 40 mile capable PHEV; though I've never tried that. Maybe if the heat pump is active, it may draw down that quickly. If that math works; you would go to 10% SOC in 450 minutes, 7.5 hours - the engine would kick ON somewhere down there, so you'd have to plug-in again to recharge your traction pack
Again, I've never tried that - because I have an outlet, two battery chargers and a half-dozen maintenance chargers. Mixture of smart and dumb ones. The dumb ones are an amp or slightly less. I cobbled those together, when work was tossing them out.