NX350h 12V battery
#16
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Where did you get this information?
When I have the computer connected to the "HV Battery" ECU while monitoring a charge, communication is lost a few seconds after the charging session finishes. All the battery temperatures come from the HV Battery ECU.
I suppose the "Plug-in Control" ECU (or maybe something else) could stay awake; but, if the HV Battery contactors are open (the HV battery is internally disconnected when not charging/discharging) and the EVSE shuts off, what would need to be monitored? The Plug-in Control does monitor the temperature of the + and - charge port terminals and the DC/DC converter; but again, if those are fine before everything shuts off, they will be fine after.
I could maybe look into it at some point; but, I don't often charge to full... and if I don't know what I'm looking for it may take a while to prove/disprove.
When I have the computer connected to the "HV Battery" ECU while monitoring a charge, communication is lost a few seconds after the charging session finishes. All the battery temperatures come from the HV Battery ECU.
I suppose the "Plug-in Control" ECU (or maybe something else) could stay awake; but, if the HV Battery contactors are open (the HV battery is internally disconnected when not charging/discharging) and the EVSE shuts off, what would need to be monitored? The Plug-in Control does monitor the temperature of the + and - charge port terminals and the DC/DC converter; but again, if those are fine before everything shuts off, they will be fine after.
I could maybe look into it at some point; but, I don't often charge to full... and if I don't know what I'm looking for it may take a while to prove/disprove.
"When the vehicle is left with the AC charging cable connected, the electricity consumption amount of the 12-volt battery increases due to controls, such as the system checking, operating. When the AC charging cable is not needed, remove it from the vehicle."
I don't have the tools like you who can do the checks and would be interested to know how much it draws.
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CdO (05-06-23)
#17
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The manual says this:
"When the vehicle is left with the AC charging cable connected, the electricity consumption amount of the 12-volt battery increases due to controls, such as the system checking, operating. When the AC charging cable is not needed, remove it from the vehicle."
"When the vehicle is left with the AC charging cable connected, the electricity consumption amount of the 12-volt battery increases due to controls, such as the system checking, operating. When the AC charging cable is not needed, remove it from the vehicle."
#18
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Can you unplug a car's 12V battery when you go on vacation in a hybrid? Or will that cause the hybrid battery to overheat? Please ONLY comment if you know. Anyone can speculate.
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weaver483 (05-07-23)
#20
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Folks;
For all you owners out there, a word of caution. Right now I'm wating for a boost. Was waiting on the Wife to get into the car and playing around with some settings. I managed to kill the 12V battery! Honestly didn't think it was that long, maybe 10 minutes, but I drained it enough to render the car dead. Needed to use the backup method of exiting the vehicle.
For all you owners out there, a word of caution. Right now I'm wating for a boost. Was waiting on the Wife to get into the car and playing around with some settings. I managed to kill the 12V battery! Honestly didn't think it was that long, maybe 10 minutes, but I drained it enough to render the car dead. Needed to use the backup method of exiting the vehicle.
I did this same thing with my 2020 RX once, in a car wash line. Thinking I was smart, I figured out how to keep the car "on" without the engine, so I could listen to the radio. In that car in accessory mode, it would shut off after I think 5 minutes. You could re-enter accessory mode I think 3 times and then you had to start the car. I thought that was a pain so I bypassed that and got away with it several times. Well, smart guy me, one time I drained the battery and it was really stuck; I couldn't start the car or disable the electronic brake. Fortunately I was close to the bypass lane of the car wash and a nice guy was able to drive up there and give me a boost.
So in fact this post is more of a heads up to everyone, if you're going to putz with the settings or whatever, more than a few minutes, turn the car on! Problem solved.
#21
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I hope this is seen as related to the 12v issue. We traveled for 10 days and left our 22 NXH in a carpark without issue. I took the extra step as was recommended somewhere on this forum and manual to disable the key fob (holding the lock while pushing unlock twice) which eliminates the car for searching for the fob.
#22
Pit Crew
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Yeah, I twice not so quickly learned "the best practice" of the 12v battery in the hybrid the hard way. LOL
I also got the NOCO GBX45 jump starter just for the worst case, my other car and to help others, since the NX should not be use to jump start another car. I also added NOCO Genius 2 charger o maintain the battery.
I also got the NOCO GBX45 jump starter just for the worst case, my other car and to help others, since the NX should not be use to jump start another car. I also added NOCO Genius 2 charger o maintain the battery.
#23
Driver School Candidate
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Is this specific to just the NX or all hybrids?
#24
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Related from the manual:
Observing the following can help suppress battery capacity decline...
Leave a low level of charge in the hybrid battery (traction battery) when leaving the vehicle undriven for a long period of time.
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SgtLip (05-08-23)
#25
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The manual says this:
"When the vehicle is left with the AC charging cable connected, the electricity consumption amount of the 12-volt battery increases due to controls, such as the system checking, operating. When the AC charging cable is not needed, remove it from the vehicle."
"When the vehicle is left with the AC charging cable connected, the electricity consumption amount of the 12-volt battery increases due to controls, such as the system checking, operating. When the AC charging cable is not needed, remove it from the vehicle."
After everything settled down it read 0.14A (~1.7 Watts).
I disconnected it; waited; it went down to 0.01A (~0.1 Watts).
Reconnected; waited, also 0.01A (~0.1 Watts).
Guess I didn't wait long enough the first time.
Switched my meter to low range... ~15mA (~0.18 Watts)
Not a definitive test; but, I don't know when I'll have an opportunity to measure after a full charge. Right after I finished, I thought I should have set the charge schedule and had the EVSE plugged in waiting for the charge to start... oh well.
#26
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#27
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Maybe you missed the alert?
#28
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I was always under the impression that if you are running the car in ACC mode (i.e. turned on but not in READY mode) and using functions such as playing with the settings or listening to audio, then the car would pop-up an alert in the instrument display warning of possible battery discharge. I know my Gen 1 NX did this and I'm pretty sure I've seen this on my Gen 2.
Maybe you missed the alert?
Maybe you missed the alert?
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SenorValas (05-09-23)
#29
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Highly suggest keeping the car running and use the traction battery if you are waiting. Make sure the READY light is lite and since the gas engine doesn't start unless you are extremely low on the hybrid battery it's better that way. Also, while you are on READY, it will also charge the 12V battery while you are idle as well.
#30
Driver School Candidate
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My apologies. I was replying to the part where they said to not use the NX to jumpstart cars. Is that a NX issue or a hybrid issue?
Last edited by Tarnshoe; 05-09-23 at 07:55 AM.