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Thread: Battery Drained??

  1. #1
    Senior Member mitsumi's Avatar
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    Battery Drained??

    Can someone help me??

    Not sure if my battery got drained. Becoz my key fob doesnt work to lock unlock the car so i opened the car via key.

    No lights, no alarm, no dashboard lights all none even the headlights.

    The only reason i can think of was my amplifier it was left open.

    i just couldnt make my car to start!!


        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage GLS 1.2 manual: 26.3 mpg (US) ... 11.2 km/L ... 8.9 L/100 km ... 31.6 mpg (Imp)


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    Senior Member Top_Fuel's Avatar
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    Your battery has apparently discharged for some reason. It's possible that your battery is bad...OR you left something on in your car....OR your amplifier (or some other device) is draining the battery when the car is off.

    1. Charge your battery.
    2. Have the battery load tested to verify it's OK.
    3. If you think it's related to your amplifier, pull the fuse (or power lead) going to the amplifier and let the car sit overnight.
    4. If your car fails to start again after sitting for a long period of time (because the battery is dead again), you may have to do a parasitic draw test to check for abnormal electrical drains on the car while it is not running.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 51.4 mpg (US) ... 21.9 km/L ... 4.6 L/100 km ... 61.8 mpg (Imp)


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    Daox (05-24-2018)

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    Administrator Daox's Avatar
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    Great analysis Top Fuel. The only thing I can add is the possibility of a failed alternator which is pretty unlikely.
    Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar

    Current project: Alternator delete with regen braking modification

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 45.6 mpg (US) ... 19.4 km/L ... 5.2 L/100 km ... 54.8 mpg (Imp)


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    Top_Fuel (05-24-2018)

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    Moderator Eggman's Avatar
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    Hey mitsumi how's your new headlights? Do you think they might contribute to this?

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 50.2 mpg (US) ... 21.4 km/L ... 4.7 L/100 km ... 60.3 mpg (Imp)


  7. #5
    Senior Member Mitz's Avatar
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    Mitsumi you should measure the battery with a voltmeter first so that you can have at least an idea. Then you can follow Top Fuel's suggestions.

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    Senior Member mitsumi's Avatar
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    Sorry late post,

    i got it working now. I had to bring the battery to a car batt. store near my place. Lucky me!

    But i'll still have to monitor it, if it drains even if the amp switch is off.

    I never had any other mods lately only the HID.

    @Eggman
    not sure if the HIDs. Whenever i turn it on i dont noticed any dimming of the dashboard lights etc. But i just cant identify since im not good at electricals.

    anyways i'll update this thread if anything happens after charging the batt and leaving the car for a week without use if it drains again

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage GLS 1.2 manual: 26.3 mpg (US) ... 11.2 km/L ... 8.9 L/100 km ... 31.6 mpg (Imp)


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    Daox (05-27-2018)

  10. #7
    Moderator Eggman's Avatar
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    Quote Originally Posted by mitsumi View Post
    i got it working now.
    That's good news.

    Keep in mind that when a lead-acid battery is discharged as much as yours it loses some of it's capacity to store and deliver electrical energy and also shortens it's life. Refer to this Wikipedia article for more info: Lead–acid battery - Sulfation and desulfation

    Though you got things working for now, your battery won't last as long as it should after being fully discharged.

    Learn more here: Battery University | BU-201: How does the Lead Acid Battery Work?

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 50.2 mpg (US) ... 21.4 km/L ... 4.7 L/100 km ... 60.3 mpg (Imp)


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    mitsumi (05-27-2018)

  12. #8
    Senior Member Mitz's Avatar
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    Quote Originally Posted by mitsumi View Post
    ...
    anyways i'll update this thread if anything happens after charging the batt and leaving the car for a week without use if it drains again
    I would not do that if I were you.

    Instead, find a shop that has a battery tester that can measure the state of health (SOH) and state of charge (SOC). Also, grab a Fluke clamp meter to measure parasitic drain.



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    mitsumi (05-27-2018)

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