battery issue? Left my prime parked for 2.5 weeks

It probably just needs a jump start.
Get the battery checked-out tomorrow. I'm assuming the car wasn't plugged-in and charging that entire time. That will draw down the 12VDC battery too.

 

While your traction battery is charging; portions of your 12VDC systems are energized to ensure power to ECU & cooling fans; it's not really designed to provide a 'recharge' of your 12 VDC battery - though it does get some voltage in the process.
I believe that your 12VDC battery is below 10.5 VDC, that's about the voltage the can't close the relays to engage the DC-DC converter, to put the car into ready mode.
I need to put my gen4 on a battery charger about once a year, when I find it below 11.5 VDC - car still goes into ready mode at that level.
I didn't have this problem when my car was a daily driver, but now that I'm retired and only drive a few times a week, I've noticed the battery getting low and I do unplug the car when the battery is finished charging.

 

Sounds like the 12V battery was drained by normal car functions while parked. It had the charge for the first start, but was left too low for a second. A mile is nowhere near enough time to replenish the energy used for starting. Leaving it on might have been the best plan

 

Yep, most likely that 12-volt needs some TLC. My wife is retired so her Corolla Hybrid 12-volt battery is low even after a week if she doesn't drive it somewhere....so 2 1/2 weeks would really leave it low.

 

toyota dealers having been charging $400. for at least 20 years. hey, there's a sucker born every minute, and car dealers know how to take advantage.
congrats on the free replacement, you can bet toyota won't pay them $400.!

 

$400? Wow, for our 2017 Prius, I replaced the 12-Volt with one from the dealer just last August and it was $261. Maybe they charged Toyota $400 for it.

I do like the TruStart batteries, though...comes with an 84 month warranty and I noticed the CCA went up to 470, a lot more than the one installed at the plant.

 

Get the 12 volt tested, say with an electronic load-tester. The 2.5 week hiatus is the likely cause.

 

Last time I checked, Wally had them for around $175. You'll need to clear out your trunk; if you want them to install it. I've been looking; ever since I've had to put the car on a charger every once in a while. It still test good with my old carbon core battery tester; but diminished. I may replace it if I can find a really good deal.
Don't know since I still remember $50 batteries; EPA, recycle mandates??????

That 84 month warranty is depreciated against that $400 retail price, so if that battery makes it past 42 months a battery on a dealership sale may be a cheaper buy than exercising that warranty option. I used to play that game when I worked in an auto parts store, in high school. I was amazed that a few of them would insist on the warranty; even though it would cost them $20-$30 bucks more. Maybe it was me and they just didn't understand. The customer is ALWAYS right.