Charging hybrid and aux batteries?

Greetings all...been a long time since I've posted.

My 2002 Prius seems dead...I tried starting it the other day and it did start briefly, then shuddered, and now no signs of life when I twist the key. Its been sitting for months. After doing some reading I'm wondering if the aux battery and possibly the hybrid battery charges are below threshold for normal operation. With the pandemic and working from home I've hardly driven the car for many, many months, and I didn't think ahead on this and do any purposeful regular driving to keep things charged. What is the best approach?

 

Thanks. Both batteries are about 4 years old. I'll try charging the aux battery and see what happens. It is definitely not worth it to me to have it repaired if it still won't start after that. Sad. The car only has about 130K miles on it. I'm sure there is a lot of life left in the gasoline fired motor...hybrid system has likely brought an early demise.

 

Thanks for the replies, folks.

It is an aftermarket hybrid battery...wasn't my decision...was put in just before I took possession of the car. Over the years I've had it there is frequently a red triangle...goes away during nice stretches of dry weather, so I think there is leakage that is more pronounced when the environment is damp. The car has issues unfortunately.

I have a good trickle charger and will charge the aux battery and see what happens.

 

So I installed a new 12V battery. When I turn the key to the ON position everything springs to life as far as the display and such, but when I twist the key to the START position nothing happens, and as you would expect when I set the transmission to D or R there is no power to the wheels. Any suggestions? I do recall that, before this most recent debacle, sometimes the gasoline-fired motor would shut off when I didn’t expect it (like right after starting the car from a cold state).

 

I’ll put a charger on the 12V battery overnight.

i may have a scanner I can use with this car to check for codes.

is there a way to charge the drive battery?

[EDIT]

The battery voltage is measuring 12.85VDC when disconnected from the system. Should be fine but I’m going to put the charger on it anyway.

And by the way thanks for the response. I do realize this is not binary stuff...I’m not expecting that it is a simple answer or that anybody here is going to hold my hand through a complex repair...I’m just hoping for some starting points/directionals.

 

Hi all…resurrecting this latent thread. So I full charged the auxiliary battery, still won’t start

when I twist the key the main display goes black. I pulled codes and came up with P3006. I cleared codes and it did not return but there is no change in the symptoms…I’m assuming the car needs to be running to regenerate the code. The HV battery is a Dorman replacement the previous owner had installed in 2015, and the car has done a LOT of sitting in the intervening years; only driven about 24K miles between 2017 and present, and the last year it has mostly sat. This is likely a situation where the HV battery modules should all be replaced and the buss bars inspected, etc., yes?