M4 Battery failure

kubax86 · 10-27-2018, 04:47 PM

Hello,
I've bought 2015 M4, when it came to me it didn't have charged battery, so i pull it out and then charged battery with some proper RC Charger( Hyperion eos 720i) capable of charging liion,lifepo4 and others.
It was charging for 15 hours, and charged 59Ah/ to 13,8V.
Now its working normally, but DME is showing that battery is worn out, and in iDrive i got notification that i should replace battery.

Whats the solution? I heard something about 'unlocking' the battery.

Thanks

Bubu88 · 11-03-2018, 10:09 AM

Charging the battery after removing it from the car is a no-go on F Series Cars. Your car has sensor that monitors everything going in and out of the battery. If you recharge a dead battery you should only do it via the designated charge points in the engine bay, because then the sensor will get that you charged it.

What you need to do now is relearn the IBS / Battery via ISTA so the system thinks you installed a brand new and fully charged battery

10-27-2018, 04:47 PM	#1
kubax86 BimmerPost Supporting Vendor 1786 Rep 3,055 Posts Drives: M2 Join Date: Jul 2017 Location: World iTrader: (8)	M4 Battery failure Hello, I've bought 2015 M4, when it came to me it didn't have charged battery, so i pull it out and then charged battery with some proper RC Charger( Hyperion eos 720i) capable of charging liion,lifepo4 and others. It was charging for 15 hours, and charged 59Ah/ to 13,8V. Now its working normally, but DME is showing that battery is worn out, and in iDrive i got notification that i should replace battery. Whats the solution? I heard something about 'unlocking' the battery. Thanks
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11-03-2018, 10:09 AM	#2
Bubu88 Enlisted Member 9 Rep 41 Posts Drives: F80 M3 Join Date: Dec 2015 Location: GE iTrader: (0)	Charging the battery after removing it from the car is a no-go on F Series Cars. Your car has sensor that monitors everything going in and out of the battery. If you recharge a dead battery you should only do it via the designated charge points in the engine bay, because then the sensor will get that you charged it. What you need to do now is relearn the IBS / Battery via ISTA so the system thinks you installed a brand new and fully charged battery
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