12V battery going dead

the traction battery can never be too low to charge a 12 volt, unless it is broken.

have you tried toyota customer service to open a case?

 

there is an 800 number in your warranty manual

 

I have a feeling your dealership is lying to you. Can you take the car to another dealership? If your battery is good and there isn't a parasitic drain on your system - you must be leaving the headlights-on or something to kill the battery. Interior lights wouldn't be able to drag the battery down far enough to prevent it from going into ready mode in 2 hours. Any aftermarket 12 VDC accessories installed?

I'd probably buy a cheap lithium battery jump-pack, just so I don't get stranded again.

 

If your going to do that; I'd wire it into a manual multi-battery RV switch. If you hard wire directly into the cars system, the dealership can claim that your modifications is what fried your electrical system. You can switch it on to recharge or jump the car. Switch it off whenever you go to the dealership. If there is a parasitic drain within the car; supplying it with 24x7 power will likely cause an electrical failure - hopefully while it's still under warranty. BTW; if your only going to use it to jump start the car - 5-10Ah battery should be able to do the trick. Much less costly than the big boy...

In the gen5; doesn't the lighter and USBs go dead when you shut down the car, so it doesn't drain the battery?

Good Luck....

 

Measure it? Or get someone to do it? Dealership won't, or did but didn't divulge their readings?

IIRC so far you've put a clamp meter on it, but I believe they're not sensitive/accurate enough for milliampere measurement.

It should be around 20 milliamperes.

This is a new car, under warranty; and you're talking about putting a secondary 12 volt in there??

 

Mendel is right , and I am about getting bored of this excessive battery drain case

 

There is another problem here, as only ~ 1% of owners are reporting 12-V-battery issues. You and/or the dealer need to figure out and solve it.

Charge the 12-V battery from the traction battery? What if the traction battery is low, too? Moreover, with the rate of drain you claim, that would drain the traction battery and brick the car quickly as well.

 

Hey last call
Enjoy

 

What he is experiencing is far from normal. He is implying that the parasitic drain is 20 A now, which is necessary to drain the 45-Ah OEM battery in merely 2 hours. Now, that's a big parasite!

In any case, it is the dealer's responsibility to fix it under warranty. If they can't fix it, then the car needs to be returned to Toyota.

 

Just saying my prime is only weeks old The second day the windows were tinted hrs doors and hatch opened no issue starting few days later it was front end filmed half a day in the shop
Plus there is a electronics rust unit forever on(parasitic drain)no issues starting I just today installed a receptacle nearby the PP so now my second battery tender is in use to the 12v battery planning for next winter usage