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post #1 of 2 (permalink) Old 03-29-2015, 04:12 PM Thread Starter
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Post 2006 Prius not starting - battery jump - which battery is dead

Recently my prius battery died while waiting outside a shop for my spouse. Engine was off and radio was on (and maybe headlights don't recollect/notice).

The car didn't start later on with engine light on. The interior lights, opening the door with fob key-clicks, windows etc. worked fine. Called a emergency tow truck and got the car jump started for ~130. Jump start was done with front bonnet opened and connecting the front battery connection to hand-held supply.

Question - So question is which battery is dead (hybrid or the auxiliary one). I hope it's not hybrid battery.
And if hybrid hope it's under warranty (76K miles, 2006 model so less than 10 years, am in California); not sure if it being a 2nd hand (i.e. am not the original owner) will matter or not.

If auxiliary battery is the cause and needs to be replaced, what would be typical replacement cost (guess ~150-200, compared to 3K+ for hybrid). Not sure if I can replace it myself.

PS: Ironically, I had 2nd dead batter the next week after first incident, I was in safeway lot and this time I made sure I turned off the power, so no radio could be on. However I forgot the headlights were on while I sat in my car with fob key inside it's slot. And boom car didn't start. (Luckily was nearby my house and CVS. Got a ~15 jumper cable from CVS went home got my SUV to jump start it myself and got it back home.)

Now being careful to not leave anything on and take fob key out to avoid battery draining issue.
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post #2 of 2 (permalink) Old 03-30-2015, 12:52 AM
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Your 12Volt battery died. Once these run down they do not recover well. Remember to turn off all lights and the radio. If you are going to sit in the car and run the radio or A/C remember to keep the car in the READY mode. The 12Volts will be provided by the inverter from the HV Traction battery and the car will start when the Traction battery gets low. The real problem comes when you have the car off and leave some lights on (including the inside lights).

The 12Volt battery is not cheap, but since it requires a special adapter to vent the gases to the outside while charging you have a more limited numbers of suppliers. I've just had my Toyota dealer change the batteries but some folks have used an OPTIMA battery which must be adapted for venting the hydrogen gas to the outside. My 12Volt batteries seem to last about 3 years.
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