Tip: How to Recharge the 12-volt Battery

[Danl]

LeafSpyPro will log your 12 voltages.
Here is my Leaf over about 3 days



thanks,
Dan

[csites]

LeafSpyPro will log your 12 voltages.
Here is my Leaf over about 3 days
[snip]
thanks,
Dan

Thanks Dan! Sounds like it's time I bought LeafSpyPro for my iPhone. A few further questions if you don't mind...

1) Will most any OBDII device work, or should I choose a specific one (especially one that draws the least power possible)?
2) I see references online to both Bluetooth and WiFi devices for LeafSpyPro. Which is best for my iPhone?
3) I see your logs are for 3 days. Did you have to leave the car on overnight to get those, or will the OBDII device work even while the car is off?
4) Are the logs stored in the car or on the OBDII device, and for how many days before I must download the data to my phone?
5) I need to log the 12v battery voltage for 6 to 9 months at a time to try to find out what's discharging it overnight every 6-9 months (or whether the DC-DC converter is intermittently not charging it properly while driving or L2 charging). Will I be able to get 6-9 months of uninterrupted logs some way?

Three different Leaf techs have found nothing wrong, and Nissan deflects by saying I must be double-tapping the power switch, so I'm on my own to diagnose and then prove what's happening.

[Danl]

LeafSpyPro will log your 12 voltages.
Here is my Leaf over about 3 days
[snip]
thanks,
Dan

Thanks Dan! Sounds like it's time I bought LeafSpyPro for my iPhone. A few further questions if you don't mind...

1) Will most any OBDII device work, or should I choose a specific one (especially one that draws the least power possible)?
2) I see references online to both Bluetooth and WiFi devices for LeafSpyPro. Which is best for my iPhone?
3) I see your logs are for 3 days. Did you have to leave the car on overnight to get those, or will the OBDII device work even while the car is off?
4) Are the logs stored in the car or on the OBDII device, and for how many days before I must download the data to my phone?
5) I need to log the 12v battery voltage for 6 to 9 months at a time to try to find out what's discharging it overnight every 6-9 months (or whether the DC-DC converter is intermittently not charging it properly while driving or L2 charging). Will I be able to get 6-9 months of uninterrupted logs some way?

Three different Leaf techs have found nothing wrong, and Nissan deflects by saying I must be double-tapping the power switch, so I'm on my own to diagnose and then prove what's happening.

First, you need to research the LeafSpy thread in Accessories/mods....CanBus. It has information much above my knowledge level.

You do not need the car on all the time. but data collection may be hit and miss when the car is off. That's OK. it will still give you good data when it is on, or when it is charging. so you will get good data at least once a day. I had removed the times with questionable data on my chart, but you still can see what the 12v is doing.

Turn on logging and drop box. The phone is storring the data and putting it into dropbox on the internet.Tthere it will say day after day no mater what you do with the car or phone. I then pull the file from dropbox into my lap top and chart it with excel. Get me one of your log files and I can chart it for you.


Thanks,
Dan

[csites]

First, you need to research the LeafSpy thread in Accessories/mods....CanBus. It has information much above my knowledge level.

Thanks. I just purchased an LELink bluetooth OBDII adapter on eBay for $20, per Turbo3's iOS-related May 16th post near the end of the thread you mentioned.

[Danl]

Added another 5 days or so.

When the car is on or when charging the dc-dc drives to 14v for a short time. Then drops back to maintain at 13v. So those readings are of the dc-dc rather than the12v battery. You also see times at 12v. This fluctuates between 11.7v and 12.5v depending on the 12v SOC.

Finally there are times that I have the accessories on(hit the power button 2 times without stepping on the break) in those you see the 12v start at 12v and ramp down over time. One time is as low as 10.5v.

This is all normal.

Thanks,
Dan

[Marktm]

Thanks. I just purchased an LELink bluetooth OBDII adapter on eBay for $20, per Turbo3's iOS-related May 16th post near the end of the thread you mentioned.

Has the adapter worked as expected? Can you leave it in place without draining the 12 volt battery? Does it restart seamlessly each time you start your Leaf? Still holding out for consistent good results with iOS bluetooth LE.

[Danl]

OK, Today I went out and the 12v would not boot up the car. Here is what data I caught.



The car had completed an 80% charge two days ago and was not driven on Aug2nd. The OBDII was pluged in all the time and Leaf spy had been left on on my phone all day and night on Aug 2nd. But it only caught data for 2 minutes in the morning I added the blank area in the chart to show that I have a day with no data.

The car would not respond to any attempt to charge or turn it on. I had to put a 12v charger on it to get any response. It started at 8v and dropped to 6v with 7 amps going from the 12v charger into the battery. It would not recognize the key fob at one point and would not connect to Leafspy with the car off. Kept trying to turn the car on with a little wait for the 12v charger to bring up the 12v a little.

More later.....

[soldcake]

hmm.... the 12v battery normally does not go from 12v to <8v instantly. you were able to run accessories and saw the voltage to drop to 10+v gradually..... did you check the ODB-II dongle for any sign of short circuit happened?

[Marktm]

A lead acid battery that drops below 10 volts or so - usually under an extremely heavy load (doubt you have that) is likely a dead battery - I'd guess you know that!

[Danl]

hmm.... the 12v battery normally does not go from 12v to <8v instantly. you were able to run accessories and saw the voltage to drop to 10+v gradually..... did you check the ODB-II dongle for any sign of short circuit happened?

Hello soldcake,
I did not say it went from 12v to <8v instantly. I said I did not get data in that timeframe. I assume it went down sometime during the Aug 2nd time that LeafSpy did not get data.

Thanks,
Dan