Prius (2nd gen) FOB battery: is CR2025 compatible w/ CR2032

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by priusrust, Feb 23, 2026 at 1:23 PM.

  1. priusrust

    priusrust Member

    Joined:
    Feb 10, 2018
    216
    79
    0
    Location:
    MA
    Vehicle:
    2004 Prius
    Model:
    N/A
    Hello,
    Being lazy, I had the battery place pop a new battery in my FOB. Worked for a while, then did not open doors. Decided to replace shell as old is worn. Opening FOB up, I noticed it was a CR2025, and not the recommended CR2032 . I understand the size is slightly different. Could this CR2025 battery have affected operation? (FOB unable to open doors)
    Thanks!
     
    #1 priusrust, Feb 23, 2026 at 1:23 PM
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    114,512
    52,271
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    same voltage, but your not getting solid contact. didn't hurt anything
     
    #2 bisco, Feb 23, 2026 at 1:26 PM
    Brian1954, mingc and priusrust like this.
  3. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
    16,808
    8,595
    0
    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    it's a thinner battery, so if the contact is not good, it would affect the operation
     
    #3 JC91006, Feb 23, 2026 at 1:26 PM
    Brian1954 and priusrust like this.
  4. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    114,512
    52,271
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    did the battery place charge you for their mistake?
     
    #4 bisco, Feb 23, 2026 at 1:27 PM
  5. PriusCamper

    PriusCamper Senior Member

    Joined:
    Mar 3, 2012
    12,973
    5,276
    0
    Location:
    Pacific Northwest, USA
    Vehicle:
    2007 Prius
    Model:
    Two
    Sounds like the battery they changed is thicker and forcing it in there could of damaged it and now they might have to replace it. I'd go back and talk to the manager about their policy for damaging a customers FOB. Businesses charge way more than $2 cost of battery for this "service" and now its time for them to lose money replacing the FOB they broke.
     
    #5 PriusCamper, Feb 23, 2026 at 2:16 PM
    priusrust likes this.
  6. priusrust

    priusrust Member

    Joined:
    Feb 10, 2018
    216
    79
    0
    Location:
    MA
    Vehicle:
    2004 Prius
    Model:
    N/A
    I have yet to go back (blizzard today). I had a hard time getting battery out...then I saw it was a CR2025. I'll try the correct battery, hopefully it will work. At any rate, I'll let them know either way. ...2032 is marked right on the cover!
     
    #6 priusrust, Feb 23, 2026 at 2:43 PM
    bisco likes this.
  7. jdenenberg

    jdenenberg EE Professor

    Joined:
    Nov 21, 2005
    3,952
    1,949
    1
    Location:
    Trumbull, CT
    Vehicle:
    2020 Prius
    Model:
    LE AWD-e
    Besides being thinner the CR2025 has less energy capacity than the CR2032 and will mot last as long.

    JeffD
     
    #7 jdenenberg, Feb 23, 2026 at 2:53 PM
    Brian1954, mingc and priusrust like this.
  8. mingc

    mingc Member

    Joined:
    Oct 23, 2018
    73
    55
    0
    Location:
    Portland, OR
    Vehicle:
    2023 Prius
    Model:
    XLE AWD-e
    CR2025 and CR2032 are the same diameter, 20mm, but the CR2025 is 2.5mm thick compared to the CR2032 which is 3.2mm thick. As you can see, the dimensions are reflected in the battery's number. Both are 3V and the thinner battery probably did no harm to the fob.
     
    #8 mingc, Feb 23, 2026 at 7:38 PM
    Last edited: Feb 24, 2026 at 12:03 AM
    pasadena_commut, priusrust and Brian1954 like this.
  9. priusrust

    priusrust Member

    Joined:
    Feb 10, 2018
    216
    79
    0
    Location:
    MA
    Vehicle:
    2004 Prius
    Model:
    N/A
    (I think you meant CR2032) So it is conceivable while the CR2025 did no harm, it may have caused a malfunction by being a 1mm less thick (?) as in perhaps it did not contact (reliably) the contacts it was intended to. We'll see. Thanks
     
    #9 priusrust, Feb 23, 2026 at 8:35 PM
    mingc likes this.
  10. pasadena_commut

    pasadena_commut Senior Member

    Joined:
    May 2, 2019
    2,770
    831
    0
    Location:
    Southern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    CR2032 is the more common size for key fobs, and it is hard to imagine that any battery shop wouldn't have those on hand. CR2025 are typically used in watches and other locations where shaving off .8mm is worth the loss of capacity. The shop probably just screwed up, and they really should just would swap it for you for free.
     
    #10 pasadena_commut, Feb 23, 2026 at 9:01 PM
    mingc, fuzzy1 and priusrust like this.
  11. mingc

    mingc Member

    Joined:
    Oct 23, 2018
    73
    55
    0
    Location:
    Portland, OR
    Vehicle:
    2023 Prius
    Model:
    XLE AWD-e
    Yeah, numeral dyslexia.
     
    #11 mingc, Feb 24, 2026 at 12:01 AM
    priusrust likes this.
  12. dolj

    dolj Senior Member

    Joined:
    May 14, 2012
    8,507
    4,316
    0
    Location:
    Wellington, New Zealand
    Vehicle:
    2007 Prius
    Model:
    N/A
    Nope as the following posts have noted the correct battery size is CR2032. The CR2025 that the OP received was thinner. So while it would not have caused damage (they are both 3 V), there could be problems with poor contact causing the fob to intermittently lose power.
     
    #12 dolj, Feb 24, 2026 at 6:13 AM
    Brian1954 likes this.
(You must log in or sign up to post here.)