Lead acid battery replacement advice

As there is no indication about a degrading 12 volt battery like a struggling starter motor in an ICE, it’s condition that can bite you, and I am sure that is the reason for Renault advising replacement after 3 years. A bad 12 volt battery leads to the “Check Electrical System” dash message, talked about earlier here. It’s both a somewhat confusing message, and it seems to be not exclusively for a bad 12 volt system.

Today I noticed there is a field the EVC called “Battery 14v to be changed display”, with possible values “-“, “Soon”, or “Now”. That seemed to be a fine candidate to add to the 12 volt screen. It’s already on the development branch on github and will make it in the next release. It’s the 4th line called “Replacement advice”.

Feedback is appreciated! We’re interested to know if there is a CanZE “soon” message before the dreaded dash message, if the dash message corresponds to this CanZE message, and if so, whether the “12 volt battery symbol” (rectangle with two knobs on top) was also lit on the dash.

4 comments on “Lead acid battery replacement advice
  1. cose385 says:

    Beside displaying this info in “12V battery” section, this warning (everything other than ‘-‘) could be displayed as a warning immediately upon starting CanZE?

    • Jeroen Meijer says:

      Could yes, but first we need to establish if it’s anything good to be honest. My battery is fine, so no way (yet) to know. Feedback appreciated.

  2. I had the message “Système ELEC à contrôler” 4 times since end of december (when my traction battery was upgraded to 41 kWh).
    (there is the -orange- maintenance icon + the battery with exclamation mark icon, but not the red little battery with “+ -” an)

    I checked with canZE, also this morning while I had the warning, but the Replacement advice is still at “none”.
    (my 12V battery is 2 years old)
    Voltage of 12V battery reported by CanZE was 13.2V/13.3V while on, then with car off, went down to about 12.2V (which looks OK I guess).

    How the 12V current measurements can be interpreted ?
    “Courant batterie 12 volts” (I had ~ 60 and down to about 5-10 with heater off)
    “Charge DCDC %” (varying, values a bit lower than “Courant batterie 12V”. With car off, around 5, and the 12 V current went close to 0)
    => is the 12 V current (in Amperes ?)the global output of both the Charging 400V->12V converter, and 12V battery? (i.e. some of the converter output may or may not be charging the battery, but it is not be shown here?)
    => what is “Charge DCDC %” is it the current from AC-AC converter to 12V battery ? Is it Amperes? (why is there a %?)

    • Jeroen Meijer says:

      Current is in amps yes. DCDC % is to be read as “DCDC converter load”. AFAIK the converter is capable of delivering 1kW (= 80 amps = 100%). Sorry for the late reply.

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