A short video of my 2017 GTR's battery test that I did this morning is all I wanted to share. My Lithium Ion battery has been giving me trouble as of late; for example, there was a time when the red battery symbol warned me to pull over. The second was when the car almost skidded to a halt and the "check engine" light came on; to my astonishment, a rapid scan of the on-board diagnostic system revealed that all eight ignition coils were defective. So far as I am aware, I have never experienced a misfire.
After sitting all night, the video shows the battery voltage, a startup, and then the lights, radio, and heated rear screen all turn on about 30 seconds later.
Since there isn't much information available regarding typical lithium readouts, I'd like to attempt diagnosing whether the problem lies with the battery or the alternator.
Much obliged for any assistance.
Best regards
Posts: 73
Joined: Mon Apr 06, 2026
Posts: 73
Joined: Mon Apr 06, 2026
Posts: 32
Joined: Mon Apr 06, 2026
Voltage alone doesn't tell you much, but a real battery load tester, like the one I use at work, which applies a 50 amp load to the battery, will reveal how well it holds up. The alternator is also functioning properly. The majority of factors offer free battery testing.
Posts: 73
Joined: Mon Apr 06, 2026
Alright, I appreciate you getting back to me. I'm trying to fix the problem it seems to have since it's due for a service/MOT soon and I have some road trips planned into Europe for the summer.
Posts: 29
Joined: Mon Apr 06, 2026
Could you possibly provide me with a lithium battery charger/conditioner that I could use for a day or two? Due to differences in charging profile, a lead acid charger will not work.
You can get the CTEK Lithium the very next day from Amazon if you don't already have one; however, prices may vary depending on where you shop.
It's worth conditioning because getting a replacement Lithium battery for a GT isn't something you can afford to take a chance on.
PS: The lithium battery management system will cut power to the battery long before it gets too low, because the battery hates being too low.
You can get the CTEK Lithium the very next day from Amazon if you don't already have one; however, prices may vary depending on where you shop.
It's worth conditioning because getting a replacement Lithium battery for a GT isn't something you can afford to take a chance on.
PS: The lithium battery management system will cut power to the battery long before it gets too low, because the battery hates being too low.
Posts: 73
Joined: Mon Apr 06, 2026
The weather was terrible last week, so the Lithium CTEK charger sat on my desk. However, I took it for a vigorous drive on Friday and everything was fine after that. The same was true on Saturday. The video above is from this morning; the car hadn't been returned to the CTEK when I had the problem with it coming to a stop and ejecting all eight ignition coils on Sunday.
Posts: 29
Joined: Mon Apr 06, 2026
Do you use a WiFi connection in your car—either through the car's built-in hotspot or by tethering your phone to the car—to access apps like Track Pace?
By the way, do you happen to own a dashcam that remains "on" even when you turn off the engine? I'm thinking of options like parking mode, wifi gearbox or an OND2 port connection.
By the way, do you happen to own a dashcam that remains "on" even when you turn off the engine? I'm thinking of options like parking mode, wifi gearbox or an OND2 port connection.
Posts: 73
Joined: Mon Apr 06, 2026
None of them do I have 
. Does the GTR require special plugs? I recently had all the spark plugs changed; is that possible that it caused the aforementioned problem? I took my sports cats to MAP, which is close to Leeds, to have a stage 2 ECU remap done, rather than an MB dealership.
. Does the GTR require special plugs? I recently had all the spark plugs changed; is that possible that it caused the aforementioned problem? I took my sports cats to MAP, which is close to Leeds, to have a stage 2 ECU remap done, rather than an MB dealership.
Posts: 29
Joined: Mon Apr 06, 2026
The spark plugs are probably not the culprit.
I'd try turning it back on the CTEK again to see if that works.
I'd try turning it back on the CTEK again to see if that works.