Replaced 12v battery with Optima

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by F8L, May 2, 2009.

  1. tom1l21

    tom1l21 Member

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    Yes that is correct, all accessories off too.
     
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    91K miles on my 2004. I decided to replace the original equipment 12V auxiliary battery today as a preventive move, as cold winter weather is approaching. This morning with temp in the high 30s F, the battery voltage was 12.2V with the car IG-OFF.

    The correct battery cost $138.70 plus tax at the parts counter of Precision Toyota of Tucson. It would have cost a few dollars more at Desert Toyota, Tucson.

    The part number is 28800-21170 and the battery was manufactured in July 2009. That part number is for 2G Prius that have Smart Entry / Smart Start. Base Prius use a smaller-sized battery. The voltage was 12.9V out of the box.
     
  3. tom1l21

    tom1l21 Member

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    Well I got a new Optima from Amazon and immediately took it to Auto Zone to be trickle charged. They said that on their machine, it reported a reading of a 50% charge. I let it stay there for 24 hours and when picking it up, they said the reading was a bit above 100%. Installed the new battery and works flawlessly. No more flashing/dimming lights, no weird alarm chirps, and no clicking noises. Guess the old battery needed a good trickle charge before being installed.
     
  4. richard schumacher

    richard schumacher shortbus driver

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    Thanks for the update. Apparently, unlike eLearnaid, Amazon does not charge the battery immediately before shipping.
     
  5. hpartsch

    hpartsch Member

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    Patrick, thanks to you price guidance I saved +40 bucks. I called my toyota for a replacement battery, they wanted 188. I tried calling the other toyota parts place today (its usually cheaper) for a price quote and they were closed. I called back the closer toyota and said the other one said they would sell me it for 139, could you match it. With no hesitation the guy said yes.
     
  6. F8L

    F8L Protecting Habitat & AG Lands

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    Good job on getting it cheaper. Patrick is a good guy to have around. ;)
     
  7. Aaron

    Aaron Member

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    Can a trickle charger be connected under the hood (relay box- just like charging the battery) while replacing the 12V so as to not lose any radio, GPS Navigation, etc. settings?

    I've heard of people using a spare battery to give the car constant juice so the settings are not lost. I would think a charger would do the same.
     
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    That has worked for me on previous cars. I have other chargers, but for that application used a 0.5 amp charger, originally intended for charging motorcyle batteries. All you need to accomplish is to supply enough voltage for the memories.

    In my case the battery was under the hood, and I clamped the cables to the battery cable positive lead and a ground. But I think with prius what you've described would work fine.
     
  9. seilerts

    seilerts Battery Curmudgeon

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    It depends on the charger. Some will click off as soon as you remove one of the terminals in the back. A jump pack works better.
     
  10. F8L

    F8L Protecting Habitat & AG Lands

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    We always used a 9v battery wired to a cigarette lighter adapter. You could just plug it into the cigarette lighter outlet and it would keep all your presets. I'm not sure if it would work on a Prius because those outlets stop supplying power when the car is off. Hmmm
     
  11. Agape

    Agape Member

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    Or any 2nd battery or another car with jump leads attached to the terminals while removing battery.
     
  12. LIPriusFreak

    LIPriusFreak Can I haz JDM?

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    I used a trickle charger when replacing the OEM 12v with an Optima yellow top...worked perfectly...no settings lost no triangle of death, etc...
     
  13. Aaron

    Aaron Member

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    I do have a riding lawn mower battery. Would connecting jumper cables from that to the connection on the fuse box do the trick?
     
  14. Patrick Wong

    Patrick Wong DIY Enthusiast

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    It would.

    Owners who use an auxiliary 12V source when replacing the 12V battery need to be very careful not to short the positive terminal to ground when removing the cables.
     
  15. larrydunn

    larrydunn New Member

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    There is currently a direct replacement battery for optima for the prius the number is DS46B24R which requires no changes to the car. It is a direct fit. LDD:mod:
     
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  16. BassInstinct

    BassInstinct Junior Member

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    Just got my yellow top online direct from Optima. Couldn't be easier transaction. Does the car run better with the Optima? Could be....

     
  17. 2009Prius

    2009Prius A Wimpy DIYer

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    It would be nice to see some numbers from testing these Optima batteries. For example, turn the car IG-ON by pushing the power button twice without pressing on the brake. Turn the climate control fully off. Then turn the headlights on. What is the battery voltage? Then turn the rear defogger on. What is the battery voltage?
     
  18. lopezjm2001

    lopezjm2001 Senior Member

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