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Tesla Roadster Secondary Battery

Discussion in 'Roadster: Technical' started by racevpr, Feb 16, 2016.

  1. racevpr

    racevpr Member

    Joined:
    Feb 22, 2015
    Messages:
    25
    Location:
    Phoenix, AZ
    The second Roadster battery resides behind the passenger headlight, behind a wheel well curtain.

    It is a 12 Volt, 8 Amp Hour AGM battery, which is a sealed, maintenance-free design, instead of a wet cell which requires
    periodic maintenance. This battery receives a constant charge from a DC to DC converter in the main propulsion battery pack.

    These batteries are designed to last no more than 3 years in ideal temperature controlled environments. In a Roadster,
    especially in 4 zone climates, you are lucky to get two years out of this battery.

    I changed my battery over two years ago, upgrading the 12V-8AH to a larger capacity 12V-12AH GPS UPS grade battery. This size fits perfectly
    into the battery bracket, and requires two minor modifications - 2) 1/4" spacers for the mounting bracket, and a terminal to F2 Spade
    lug conversion for the 12V-12AH UPS battery. I have had no issues, and instructions on how to install this superior performance replacement battery can be found at:

    Roadster Battery.jpg
     

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