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Discussion Starter · #1 ·
I have 13.500 kms on my MX 30 first edition. Until a few days ago we were very happy despite the limited autonomy.
Three weeks ago when I went to get the car in the morning it was totally dead. Mazda assistance told me that may be the small battery was discharged. I connected other battery and the car star work again. I sent the car to the Mazda and they did nothing.
Two days ago it happened again. This time I measured the small battery and it only had 3 volts. I connected another battery and the car started working. Immediately measured again the battery and had 12.5 volts!!!
I'm still waiting for the conclusion of Mazda but in the meantime If somebody has a clue about this issue, I'll be very grateful if you like to share with me.
Best regards
 

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Can we start with the basic premise that the 12v battery is exactly the same as used in ice cars and therefore can have all the same problems. The ev 12v battery is charged using a dc to dc converter from the hv batteries and powers the auxiliary components such as radio, lights etc as well as the relays that allow the high power battery to start the car. ( anything that is 12v I believe is powered using the 12v battery). Therefore any thing left on such as internal lights can drain the battery. Cold weather can affect the batteries as on an ice car.

I am told that in ice cars the starting process produces a high current load which in turn keeps the battery plates from furring up. Evs don't have the same start process so the batteries aren't exercised in the same way hence the possible shorter life span as the plates in the battery can "dirty" up.

The 12v battery should sit at a constant voltage so it may be an idea to multimeter the battery and check every few hours to see if the voltage has dropped, a sure sign (assuming nothing is left on) that the battery is on the way out.

If you where unlucky the dc converter may be faulty or something is placing a load on the battery when the car is off.

Happy to be corrected by anyone with more in depth knowledge!

Alan
 

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Discussion Starter · #6 ·
Can we start with the basic premise that the 12v battery is exactly the same as used in ice cars and therefore can have all the same problems. The ev 12v battery is charged using a dc to dc converter from the hv batteries and powers the auxiliary components such as radio, lights etc as well as the relays that allow the high power battery to start the car. ( anything that is 12v I believe is powered using the 12v battery). Therefore any thing left on such as internal lights can drain the battery. Cold weather can affect the batteries as on an ice car.

I am told that in ice cars the starting process produces a high current load which in turn keeps the battery plates from furring up. Evs don't have the same start process so the batteries aren't exercised in the same way hence the possible shorter life span as the plates in the battery can "dirty" up.

The 12v battery should sit at a constant voltage so it may be an idea to multimeter the battery and check every few hours to see if the voltage has dropped, a sure sign (assuming nothing is left on) that the battery is on the way out.

If you where unlucky the dc converter may be faulty or something is placing a load on the battery when the car is off.

Happy to be corrected by anyone with more in depth knowledge!

Alan
Thanks a lot. I'm checking the battery with a multimeter and the voltage has dropped from 12,5 to 11,3 in one day.
I'm not using the car now and I will wait to the next Thursday for Mazda Service again. Last time they didn't nothing.
 

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Discussion Starter · #7 ·
Sorry don't understand "just after connect" Can you elaborate more?

Alan
Yes, I'll try with my English... I checked the battery and it had 3 volts. After that I connected other battery, then the car turn on. I disconnected that battery and checked again and it had 12.5 volts.
Just connect and disconnect and the Mazda battery was 100%
 

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Discussion Starter · #8 ·
I would just replace the lead acid battery to be honest - they can fail in ICE cars as well, usually because the water level is low. Not sure if you can top up the one in the Mazda.
Thanks. My car is my garage, 18°. I can not check the water level and the battery is new.
 

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See these as well. Apologies if they are not helpful. Does the car start with battery at 11.3v?



Alan
 

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Discussion Starter · #10 ·
See these as well. Apologies if they are not helpful. Does the car start with battery at 11.3v?



Alan
See these as well. Apologies if they are not helpful. Does the car start with battery at 11.3v?



Alan
Thanks. My car is my garage, 18°. I can not check the water level and the battery is new.
Thank you,
Thanks. My car is my garage, 18°. I can not check the water level and the battery is new.
Thank your comments are welcome. With 11volts the car star without problem. With 3 volts the car does not have any lights even on the starter button.
 

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Discussion Starter · #12 ·
I don't know the software upgrade, but I don't lock the car because is in my own garage. I think this a very good clue, I'll try it just know. Thanks a lot
 

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I have 13.500 kms on my MX 30 first edition. Until a few days ago we were very happy despite the limited autonomy.
Three weeks ago when I went to get the car in the morning it was totally dead. Mazda assistance told me that may be the small battery was discharged. I connected other battery and the car star work again. I sent the car to the Mazda and they did nothing.
Two days ago it happened again. This time I measured the small battery and it only had 3 volts. I connected another battery and the car started working. Immediately measured again the battery and had 12.5 volts!!!
I'm still waiting for the conclusion of Mazda but in the meantime If somebody has a clue about this issue, I'll be very grateful if you like to share with me.
Best regards
I have 13.500 kms on my MX 30 first edition. Until a few days ago we were very happy despite the limited autonomy.
Three weeks ago when I went to get the car in the morning it was totally dead. Mazda assistance told me that may be the small battery was discharged. I connected other battery and the car star work again. I sent the car to the Mazda and they did nothing.
Two days ago it happened again. This time I measured the small battery and it only had 3 volts. I connected another battery and the car started working. Immediately measured again the battery and had 12.5 volts!!!
I'm still waiting for the conclusion of Mazda but in the meantime If somebody has a clue about this issue, I'll be very grateful if you like to share with me.
Best regards
Font Parallel Number Circle Document
 

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I have 13.500 kms on my MX 30 first edition. Until a few days ago we were very happy despite the limited autonomy.
Three weeks ago when I went to get the car in the morning it was totally dead. Mazda assistance told me that may be the small battery was discharged. I connected other battery and the car star work again. I sent the car to the Mazda and they did nothing.
Two days ago it happened again. This time I measured the small battery and it only had 3 volts. I connected another battery and the car started working. Immediately measured again the battery and had 12.5 volts!!!
I'm still waiting for the conclusion of Mazda but in the meantime If somebody has a clue about this issue, I'll be very grateful if you like to share with me.
Best regards
I have had one occasion when the battery became flat in less than 4 hours. I was advised that leaving my iPhone charging cable plugged into the USB socket even when the phone isn’t connected can be sufficient to drain the battery! Mechanic attached jump leads and new battery to existing battery, car came back to life and I have had no problems since. I no longer have my phone charging cable in the car!
 

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After having the AM035A update done, did a short test on the USB ports. Plugged in a small USB book reader light and closed the MX-30 . After apr. half min the USB light went OFF.
 

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Discussion Starter · #19 ·
I have had one occasion when the battery became flat in less than 4 hours. I was advised that leaving my iPhone charging cable plugged into the USB socket even when the phone isn’t connected can be sufficient to drain the battery! Mechanic attached jump leads and new battery to existing battery, car came back to life and I have had no problems since. I no longer have my phone charging cable in the car!
 

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Discussion Starter · #20 ·
I have had one occasion when the battery became flat in less than 4 hours. I was advised that leaving my iPhone charging cable plugged into the USB socket even when the phone isn’t connected can be sufficient to drain the battery! Mechanic attached jump leads and new battery to existing battery, car came back to life and I have had no problems since. I no longer have my phone charging cable in the car!
I´ll
Hi,

have a look as this is a recall which your dealer can sortout
I`ll do it tomorrow. Thank you very much
 
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