E90 Battery Issue

sle39lvr · 07-11-2021, 07:28 PM

I got an E90 with 140k miles. The battery is close to 3 years old.

A couple of days ago, I noticed the clock has been reset, along with other things, but the car started fine.

Yesterday, getting back to the car after about 6 hours of getting somewhere, the car was completely dead. A jump start got it going.

Today, I removed the battery, took it to Walmart, where it was originally purchased, after thorough testing, they confirmed that the battery is completely fine (they showed me their test device displaying the message). Put the battery back in the car, started, it fired up fine.

6 hours later, I tried to start, dead again. A jump got me running again.
-------------------------

Should I just buy a new battery? Could this be something else?

Gatriel · 07-12-2021, 11:05 AM

Have you pulled codes?

sle39lvr · 07-12-2021, 05:58 PM

So, I got some numbers here:

The car started in the morning and also in the evening. We had overcast here and it wasn't that hot.

While the car was off:
At the battery: 12.37v
At the front terminals: 12.35v

I do own a BT Tool, yet need to get hands-on a Windows computer to run it (Wish they had macOS, Android, or iOS).

sle39lvr · 07-13-2021, 02:51 PM

Today's Update

Took it out for a short spin, while the engine was running:
At the battery: 14.08v
At the front terminals: 14.11v
Outside temp: ~90F

Within the last two days, the car was never dead, it started fine every time.

07-11-2021, 07:28 PM	#1
sle39lvr Captain 125 Rep 654 Posts Drives: 08 328i Join Date: Aug 2011 Location: United States iTrader: (3)	E90 Battery Issue I got an E90 with 140k miles. The battery is close to 3 years old. A couple of days ago, I noticed the clock has been reset, along with other things, but the car started fine. Yesterday, getting back to the car after about 6 hours of getting somewhere, the car was completely dead. A jump start got it going. Today, I removed the battery, took it to Walmart, where it was originally purchased, after thorough testing, they confirmed that the battery is completely fine (they showed me their test device displaying the message). Put the battery back in the car, started, it fired up fine. 6 hours later, I tried to start, dead again. A jump got me running again. ------------------------- Should I just buy a new battery? Could this be something else?
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07-12-2021, 11:05 AM	#2
Gatriel aus Deutschland 6 Rep 59 Posts Drives: 11 e91 320d Join Date: Nov 2012 Location: Berlin iTrader: (0)	Have you pulled codes?
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07-12-2021, 05:58 PM	#3
sle39lvr Captain 125 Rep 654 Posts Drives: 08 328i Join Date: Aug 2011 Location: United States iTrader: (3)	So, I got some numbers here: The car started in the morning and also in the evening. We had overcast here and it wasn't that hot. While the car was off: At the battery: 12.37v At the front terminals: 12.35v I do own a BT Tool, yet need to get hands-on a Windows computer to run it (Wish they had macOS, Android, or iOS).
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07-13-2021, 02:51 PM	#4
sle39lvr Captain 125 Rep 654 Posts Drives: 08 328i Join Date: Aug 2011 Location: United States iTrader: (3)	Today's Update Took it out for a short spin, while the engine was running: At the battery: 14.08v At the front terminals: 14.11v Outside temp: ~90F Within the last two days, the car was never dead, it started fine every time.
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