What voltage is your battery reading on a normal day?

monterey · 07-13-2016, 09:35 PM

I'm only at 12.4V. I have no problems but it seems low.

kimiraikkonen · 07-13-2016, 11:58 PM

Is that measured directly off the battery terminals with a voltmeter.....or through the hidden obd menu in the dashboard?

monterey · 07-14-2016, 12:31 AM

battery terminal

Helmsman · 07-14-2016, 04:11 AM

Been checking the voltage as well Monterey and believe 12.4v is ok (Measured on battery). Although it should be more like 12.7v when full and no load I'm assuming soon as you unlock to open the bonnet some current will start to be drained. Have been like this pretty much since I bought the car 2.5y ago so have to assume its ok.

Cheers

Ps. This is obviously with no engine.

G80indy · 07-14-2016, 08:44 AM

Depends on if wet cell or AGM.
12.4v is ~ 60-70% charge state

IMO, That's a bit low for an AGM, however they recover typically from deep discharge so maybe it needs a good topping off.
If after a good drive it is still 12.4 it may be on its way out--
I changed my Exide out when it read 12.4v after an hour drive, and it had been on a CTEK tender before the drive!
My new AGM at rest (24 hours) reads 12.8v
A load test will reveal if the battery can do its job- starting the engine

monterey · 07-14-2016, 02:23 PM

I tested my fiat and it's at 14.1V

kb9uwu · 07-14-2016, 02:42 PM

Quote:

Originally Posted by monterey

I tested my fiat and it's at 14.1V

My Caterpillar fork lift is sitting right at 12.8V

TWiTCHY · 07-14-2016, 02:48 PM

I typically see 12.4-12.7 on an AGM. Think the battery is about a year old.

07-13-2016, 09:35 PM	#1
monterey Major 339 Rep 1,239 Posts Drives: 2008 M3 Join Date: Mar 2016 Location: United States iTrader: (1)	What voltage is your battery reading on a normal day? I'm only at 12.4V. I have no problems but it seems low. __________________ A job is nothing but work.
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07-13-2016, 11:58 PM	#2
kimiraikkonen Lieutenant 275 Rep 466 Posts Drives: 2008 E90 M3 6MT Join Date: Jun 2016 Location: San Francisco iTrader: (2)	Is that measured directly off the battery terminals with a voltmeter.....or through the hidden obd menu in the dashboard?
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07-14-2016, 12:31 AM	#3
monterey Major 339 Rep 1,239 Posts Drives: 2008 M3 Join Date: Mar 2016 Location: United States iTrader: (1)	battery terminal __________________ A job is nothing but work.
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07-14-2016, 04:11 AM	#4
Helmsman Major General 4480 Rep 7,120 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	Been checking the voltage as well Monterey and believe 12.4v is ok (Measured on battery). Although it should be more like 12.7v when full and no load I'm assuming soon as you unlock to open the bonnet some current will start to be drained. Have been like this pretty much since I bought the car 2.5y ago so have to assume its ok. Cheers Ps. This is obviously with no engine.
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07-14-2016, 08:44 AM	#5
G80indy Save the Manuals 1714 Rep 2,937 Posts Drives: Z3, E46, G80 Join Date: May 2005 Location: Indy iTrader: (0)	Depends on if wet cell or AGM. 12.4v is ~ 60-70% charge state IMO, That's a bit low for an AGM, however they recover typically from deep discharge so maybe it needs a good topping off. If after a good drive it is still 12.4 it may be on its way out-- I changed my Exide out when it read 12.4v after an hour drive, and it had been on a CTEK tender before the drive! My new AGM at rest (24 hours) reads 12.8v A load test will reveal if the battery can do its job- starting the engine __________________ 2023 G80 6MT, CCBs 2002 330i Dinan, 5MT 2000 Z3 Conforti, 5MT
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07-14-2016, 02:23 PM	#6
monterey Major 339 Rep 1,239 Posts Drives: 2008 M3 Join Date: Mar 2016 Location: United States iTrader: (1)	I tested my fiat and it's at 14.1V __________________ A job is nothing but work.
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07-14-2016, 02:48 PM	#8
TWiTCHY Colonel 376 Rep 2,526 Posts Drives: '13 AW E92 M3 Join Date: Jul 2008 Location: WA iTrader: (6)	I typically see 12.4-12.7 on an AGM. Think the battery is about a year old.
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