2003 Prius Battery Issues - Toyota Prius Forum : Toyota Prius Forums
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post #1 of 17 Old 01-04-2013, 01:39 PM Thread Starter
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Question 2003 Prius Battery Issues

Help please. The battery had died earlier and needed a charge so I removed the auxilary battery in the trunk and charged it up till my meter read that it had a full charge of 12V. I did that two days ago and today the battery warning light on the dash came on. What is all this telling me? Do I need a new battery? Please help if you have an idea.
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post #2 of 17 Old 02-11-2013, 11:37 PM
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My 2002 Prius was having the same problem. I got 3 years out of my last battery and just replaced mine because I was having the same issue. I replaced the battery with a Optima D51r. I had to retro fit the cable ends and take out the battery box to make it fit but it is well worth it if you have a car like mine you plan on keeping for a while. Seems like the car really depends on a good battery to run all the electronics. Here's a link
12 Volt Toyota Prius Battery for 2001-2003 with installation kit. Hope this helps.
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post #3 of 17 Old 07-20-2013, 05:37 AM
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Hey please can you please tell me that how long does a Toyota Prius battery last? How much does it cost to replace one?


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post #4 of 17 Old 09-12-2013, 01:42 AM
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In the US, the entire hybrid system (which includes the hybrid battery pack) is warrantied for 8 years/100,000 miles.


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post #5 of 17 Old 10-31-2013, 01:21 PM
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I replaced my 12v battery on my 2001 Prius for the second time with the Optima kit I found on line for $180 as opposed to the $350+ price tag from the dealer.
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post #6 of 17 Old 07-26-2014, 11:49 PM
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Quote:
Originally Posted by Thomas Habig View Post
I replaced my 12v battery on my 2001 Prius for the second time with the Optima kit I found on line for $180 as opposed to the $350+ price tag from the dealer.
I purchased the same (probably) Optima kit from a place in California for $180. So far a year later it's been a solid battery with minimal installation headache.
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post #7 of 17 Old 12-28-2015, 08:45 PM
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I have replaced my 12v battery with the Optima kit a couple of times. I have not kept careful track, but it seems these start to deplete after about 3 years. Is that normal? I have recharged the battery and was able to start the car for about a week before it began requiring a jump box and needed recharging again. It seems something must be depleting the battery, but I am unable to determine what.

I do notice that the electronic key light alternates between being constantly on and flashing. Are there known issues with battery depletion from the electronic key security?
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post #8 of 17 Old 12-29-2015, 10:57 AM
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Quote:
Originally Posted by Ahickpoet View Post
I do notice that the electronic key light alternates between being constantly on and flashing. Are there known issues with battery depletion from the electronic key security?
No not really. But there have been some problems with the Optima batteries over the years.

A lot of the auto parts dealers and battery shops have good quality AGM replacement batteries for the Prius line now. I suggest that you try a different brand......and be sure it is charged up before being installed.

You might also want to check the battery voltage occasionally after being run and again after sitting overnight.

Cars that sit unused for long periods or that are used mostly for very short trips, of 10 miles or less, are known to be hard on the 12 V battery.

'17 Prius C-4
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post #9 of 17 Old 01-12-2016, 06:44 PM
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Thanks. Since I work at home, the car does not get driven every day, and when it does, it is often for only a few minutes. What is strange is that we can put the battery on a charger and go without issues for a few days, but it depletes very quickly and has to be charged again.

Admittedly, our battery charger is probably more suited to a museum than actual use.
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post #10 of 17 Old 01-13-2016, 04:38 PM
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Quote:
Originally Posted by Ahickpoet View Post
Admittedly, our battery charger is probably more suited to a museum than actual use.
Given your usage patterns, you NEED a small automatic tender type battery charger.
Many are available in the $25 to $35 price range.
There is a brand called Battery Tender but others are good too.

Connecting it when the car is not in use can extend the life of your battery by YEARS.

Note: but that is with a new or good battery. If yours is questionable now, a new battery AND a tender type charge BOTH are needed.

'17 Prius C-4
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