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12V battery replacement in 2004 Prius?

20 messages,  Last post on Sep 24, 2009 at 3:57 PM

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#16 of 20 Re: Weak Battery symtom??? [jpeters1970] by glouderback Sep 02, 2009 (11:36 am)
Replying to: jpeters1970 (Sep 01, 2009 10:44 am) I checked the voltage, and it was about 12.3v. I then checked the voltage on our new 2010 Prius and it was 12.5. This with everything turned off. With everything turned on, it rose to 14v.in both cars. It's a five year old battery and I don't want my wife stranded just to get more out of an old battery so I am going to replace it soon. I did a search as you suggested, and found a ton of great info. Thanks. Replies to this message: jpeters1970 (Sep 03, 2009 9:44 pm)
#17 of 20 Re: Weak Battery symtom??? [glouderback] by jpeters1970 Sep 03, 2009 (9:44 pm)
Replying to: glouderback (Sep 02, 2009 11:36 am) I'm glad I was able to assist. Based on the readings you obtained it appears that the battery may not be bad, however it is not an expensive item and as a preventative measure good to change BEFORE you start having issues. With my situation it died because I was not using the vehicle for quite some time and though I did charge it, it never revived. I got five good years out of it. I'm pleased. So far my 2004 has been more reliable than any other vehicle I've ever owned.
#18 of 20 Re: 12V battery replacement in 2004 Prius? [coontie66] by hybriddriveguy Sep 23, 2009 (5:58 pm)
Replying to: coontie66 (Jun 10, 2008 4:29 am) This is actually an AGM battery and Toyota is the best place to buy them.
#19 of 20 Re: Weak Battery symtom??? [glouderback] by glouderback Sep 24, 2009 (12:49 pm)
Replying to: glouderback (Aug 31, 2009 4:33 pm) I figured out what my wife was doing that caused the beeping. She was simultaneously pulling on the door handle and pushing the lock button when opening the door causing the Prius to put out a steady tone for about 6 seconds. I replaced the 12 volt battery anyway, as I don't want her getting stranded because of 5 year old battery.
#20 of 20 Bought a yellow Optima for my 2004 Prius by stevegold Sep 24, 2009 (3:57 pm)
Based upon the last few messages in this thread, I ordered a yellow 12V battery and their Prius kit from eLeanAid. I have not had a problem with my 2004 Prius but it has been on my mind and I am curious about the reported mileage improvements. I can use the old battery to start my backup generator. It will arrive next week.

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