Gen I main batteries

elendilmir · 10-07-2009, 10:21 AM

There seems to be very little discussion of older battery life. I just passed the 105K mark, so it's starting to weigh on my mind. Is this being discussed somewhere that I'm not seeing?

bwilson4web · 10-07-2009, 08:30 PM

The reason for no serious discussion is the absence of hard data.

Bob Wilson

tochatihu · 10-07-2009, 09:06 PM

Some of these failed quite early, which probably led to Toyota's special service campaign to reseal the modules to the elctrolyte inside wouldn't leak out and corrode the connections. Did yours have that work done? It's free.

Some have lasted for more than 300,000 miles in service. Overall failure rate of perhaps 1 to 10%? Known to Toyota; not to us.

Other than SSC 40G (above) there is not much you can do to help, besides avoiding extremely high battery temperatures. If you're curious, have some money to spend and a good Toyota shop handy, they can measure module voltages during charge and discharge cycles.

In the case of gradual battery failure, some have reported falling fuel economy first, followed by warning lights and very poor vehicle performance. Then, the diagnostic codes identify the battery or some other cause.

If you don't want to pay for that test, then I suggest you just not think about it until a problem arises.

10-07-2009, 10:21 AM	#1
elendilmir Junior Member Join Date: May 2008 Location: western maryland Posts: 5 My Car: 2002 Prius Model: Package: Base Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Gen I main batteries There seems to be very little discussion of older battery life. I just passed the 105K mark, so it's starting to weigh on my mind. Is this being discussed somewhere that I'm not seeing?

10-07-2009, 08:30 PM	#2
bwilson4web 03 and 10 Prius Join Date: Nov 2005 Location: Huntsville AL with 2003 Prius Posts: 3,848 My Car: 2010 Prius Model: III Package: #1 Thanks: 146 Thanked 366 Times in 202 Posts Friends: 20	Re: Gen I main batteries The reason for no serious discussion is the absence of hard data. Bob Wilson

10-07-2009, 09:06 PM	#3
tochatihu Senior Member Join Date: Apr 2004 Location: Kunming Yunnan China Posts: 2,404 My Car: 2001 Prius Model: Package: Pioneer #1 Thanks: 1 Thanked 38 Times in 38 Posts Friends: 14	Re: Gen I main batteries Some of these failed quite early, which probably led to Toyota's special service campaign to reseal the modules to the elctrolyte inside wouldn't leak out and corrode the connections. Did yours have that work done? It's free. Some have lasted for more than 300,000 miles in service. Overall failure rate of perhaps 1 to 10%? Known to Toyota; not to us. Other than SSC 40G (above) there is not much you can do to help, besides avoiding extremely high battery temperatures. If you're curious, have some money to spend and a good Toyota shop handy, they can measure module voltages during charge and discharge cycles. In the case of gradual battery failure, some have reported falling fuel economy first, followed by warning lights and very poor vehicle performance. Then, the diagnostic codes identify the battery or some other cause. If you don't want to pay for that test, then I suggest you just not think about it until a problem arises. __________________ DAS Tochatihu, the Hopi hummingbird kachina

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