12V Battery Replacement Recommendation

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by Tonydavid, Jan 8, 2021.

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  1. WiredKnight

    WiredKnight New Member

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    It’s 2025, but just wanted to let anyone who might need it, Amazon has OBDII memory savers that hook into OBDII and a 9v transistor battery for ~17 dollars. Search using this on Amazon:
    9V Battery Powered Memory Saver for Car Battery Fit for All OBD ll 16-Pin Interface
     
    #121 WiredKnight, Dec 13, 2025 at 7:54 PM
  2. indel

    indel Member

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    So you attach this device to the obd2 port while you are changing out the 12V battery? Would it not create excessive charge briefly when both the battery and this device are connected? Is that ok?
     
    #122 indel, Dec 14, 2025 at 10:05 AM
  3. ChapmanF

    ChapmanF Senior Member

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    It doesn't: voltage sources in parallel do not add. 12 volts ∥ 12 volts = 12 volts.
     
    #123 ChapmanF, Dec 14, 2025 at 11:30 AM
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  4. Mendel Leisk

    Mendel Leisk MMX GEN III

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    #124 Mendel Leisk, Dec 14, 2025 at 11:34 AM
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  5. indel

    indel Member

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    Speaking of 12V chargers, has anyone used this Bosch charger?
     
    #125 indel, Dec 14, 2025 at 11:37 AM
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