Might be time for new 12v battery for 2020 Prime?

Bought in late December 2020 but with a whole 40miles so maybe it was around for a few months prior and is the somewhat rare "Moonstone" interior.

I've accidentally left the headlights on a couple times and run down the 12v to where it needed a jump. Didn't seem to take very long and last time I don't think it was more than 15minutes. My problem seems to be parking in brightly lit parking lots and fussing about for a bit before hopping out and not noticing the lights are still on.

Questions:
1)Is the Prime small 12V a different animal that normal car's 12v, because all it really does is boot computer, and power headlights (and run other 12v stuff only when car is "on" and 12v connected to Big Batt power)?
Shouldn't it be a Deep Cycle or extra long life(calender long) because it doesn't need to crank engine?

2)The owners manual is just under 800pgs, almost all various electrical related features and options. Is there anywhere that allows it to be set so IF the headlights are left on and car is turned off, they will auto-shut off to save the battery after maybe 5 minutes? Or auto shut off when it reads the 12V battery is getting low, such as before it would be unable to boot computer, to avoid need to jump start?

3)Any pre-packaged add-on for cars in general to accomplish #2??? Seems like it would be a really nifty feature that could be added for almost zero cost. So many situations where it might be nice to have full headlights while getting into front door or walking down a dark street, and have them then shut off in a few minutes. IIRC my old 1972 Caddy might have had it but I never used it.

4)Any particular 12v batteries recommended for Primes, or will I do just as good at Walmart or Autozone (where I can easily warranty if needed)?

I have ordered a cheap $40 Jump Starter, which should be fine for the Prime because it only needs to be able to boot brains, not crank engine, and a set of Cig Plug with clips that should be able to boot brains off my big 10lb Power Bank I use to run laptops, etc, with Cig Socket. Big Power Bank is similar to this, with 12v Cig Socket.
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What would happen if...
5) I took out the Prime's 12v lead acid battery and hooked the Primes battery terminals to some clips off the Power Bank's 12V outlet? Would it allow the Brains to Boot and run the car (except for high load stuff like engine cooling fan and HVAC). Then run from the car's Cig Lighter to charge the Power Bank! Not sure of Power Bank's 12V Cig Socket is strictly output, I'm guessing it is and Power Bank ONLY wants to charge from its charging port which is IIRC 15.5 or maybe standard laptop 18v.
I'm not PLANNING on doing this, but might be nice to know if would for sure kill the whole car or not, if I get in some emergency situation.

PS-I know you are never supposed to Jump Start another car FROM a Prime (unless you first completely disconnect the Prime's 12v battery).

 

I've got a base 2020 Prime LE so if that is an "if" I don't think so. Seems like something every car should have in this day and age, maybe even a Govt mandated feature with optional lock out (like if you really really DO want the headlights on for extended period. I'd bet leaving lights on and running down battery, hence at least temporarily bricking the car, has resulted in lots of real harm when people do other stuff to attempt to get out of the situation.

IIRC as a battery drains it loses voltage so an aftermarket or DIY shut-off between battery and car's terminal shouldn't be too hard or expensive, but I'm electronically clueless. IMO it would sell like hot-cakes up at the front registrar of Auto-Parts store if priced under $20. Just one "save" will more than get your money's worth in time, effort, risk and 'fall out'. Plus its really bad for batteries to be run flat.

WHOA, now I'm seeing this on other thread. "The new car warranty includes 36 months bumper to bumper coverage, which includes the 12V battery. Hence that warranty would have expired in ~ 2017, three years after the first sale." And IIRC I'm coming up on 3yrs in about 2 weeks! Maybe I'll think about taking it to dealer to see if they will Warranty the battery, but that will be a PIA to drop off and pick up, probably have them claim its barely within specs after that goose it with 50Amp charger THEN check it 3 seconds later, and send me out with damaged battery to boot.
Reminds me of a story an old boss once told. He has new F-350 with extended warranty and the Tranny is slipping so he takes it to dealer and asks "should I get a rebuilt or brand new replacement A/T?" and the dealer says "Forget about rebuilt, nothing but problems, don't waste your time, it could be DANGEROUS like if your wife was driving and it starts slipping again as she is merging, etc, etc, BRAND NEW is the only way to go, costs more but what is your life worth?" Boss says "Glad I came to you! BTW I've got this extended warranty that covers the A/T" Said the dealer's face just fell.

BTW this was a guy who'd buy a brand new truck at that same dealer like clockwork on schedule every 3yrs, and they still try to screw him if possible.

 

I'm thinking even with small 12v and WITH new low energy style lights it should be able to leave lights on for a LOT more than 15 minutes and still be able to Boot Brains.

I'd let it run full flat a couple times overnight, which is really bad for batteries, so I'm wondering if its not on its last legs even if a bit early for SOP. Car has about 90K which is pretty high miles for that new.

I'm wondering if specs for what a PRIME battery needs to do is radically different. I'm not seeing any sections for "12V batteries for HYBRID cars, for their unique usage profile", just standard line of normal batts in smaller size.

 

Another one of my habits is to wear earbuds and listen off my phone, so I guess I missed the beeping. I like earbuds more than even good car stereo because of their semi-noise reducing so the signal to noise ratio is better.
Ready mode like this? Thx, didn't know it existed.

I'll experiment and see if I can leave stuff going but not risk someone driving off if they smash out a window.
Got the Jump Pack on order, plus I'll probably start carrying my big Power Bank, with 12v outlet and plug and clips, to charge up all my laptops, headlamps, phones, etc with the car off.

 

I've heard its the biggest of No-Nos to NEVER attempt to use a Prime (or other Prius) to jump start another car because it will see a big pull that can blow some big unit deep inside the system, costing thousands to dig out and fix.

So I'm thinking I should at least completely disconnect the battery before any Load Test which is basically simulation of big time jump start. I'm thinking if car is fully "off" it COULD/SHOULD be OK to Load Test battery, but I'd be nervous.