Will my battery go flat in 2 months?

kyrix1st · 08-21-2019, 03:08 AM

I had no time to grab a battery tender, so left the car as is. Will it go flat in 2 months?

Battery is an year old Bosch AGM (bla-95-l5).

m235boy · 08-21-2019, 06:25 AM

Quote:

Originally Posted by kyrix1st

I had no time to grab a battery tender, so left the car as is. Will it go flat in 2 months?

Battery is an year old Bosch AGM (bla-95-l5).

2 months is pushing it I think

roastbeef · 08-21-2019, 06:32 AM

probably.

Dpc2u · 08-21-2019, 07:06 AM

kinda a crapshoot being a couple months. It would be a good idea to put the charger on it overnight when you return before hitting the start button.

wyatth · 08-21-2019, 09:34 AM

Id be surprised if it cranked, let alone had any accessory power.

alee0729 · 08-22-2019, 08:56 PM

2.5 mo is about as far it'll go assuming a reasonably fresh/new battery.

tooloud10 · 08-22-2019, 09:44 PM

I've let mine sit almost two months and it started, but it all depends on the state of the battery when you park it.

cjm41 · 08-22-2019, 09:54 PM

I left my car in storage for 5 weeks. When I got back to it the car cranked up like I'd driven it yesterday.

I'm sure you have to consider variables like age of the battery and temperature in the garage but based on how easily my car started after 5 weeks I wouldn't rule out 8 weeks.

sibhusz06 · 08-22-2019, 11:43 PM

Brand new or close to it, the battery should last 2months even with residual current draw, but it will be at its lowest AH/CCA rating. However if you can, it would be better to disconnect the neg or positive cable if you are unable to trickle charge it.

Bartledoo · 08-23-2019, 12:18 AM

I think I had mine sitting for like 5 months over winter with the battery still connected (forgot to disconnect) and it cranked fine. Still running that battery now! It is not a new battery either.

///M Power-Belgium · 08-23-2019, 04:51 AM

Yes .

Jerezblack.m3 · 08-23-2019, 11:19 PM

I would just disconnect it.

kyrix1st · 09-24-2019, 01:28 AM

Is anyone so anal as to pull the fuel fuse out and crank few times to get the oil pressure? Seems like a good idea for dry starts.

kyrix1st · 10-16-2019, 11:00 PM

**Update: The car started fine after 8 weeks! Looks like the car went into deep sleep mode while away.

kyrix1st · 08-05-2020, 08:05 PM

It's been 4 months since I last started my 6 speeder...will definitely charge overnight and pull the fuel relay out to get the oil pressure up.

For those of you tried, is it the fuse #70 for fuel relay?

08-21-2019, 03:08 AM	#1
kyrix1st Colonel 2362 Rep 2,362 Posts Drives: G87 M2; E92M3 MT&DCT; M3 euro Join Date: Sep 2014 Location: nyc iTrader: (0) Garage List 2004 BMW Z4 [0.00]	Will my battery go flat in 2 months? I had no time to grab a battery tender, so left the car as is. Will it go flat in 2 months? Battery is an year old Bosch AGM (bla-95-l5). __________________ Pass me if you can.
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08-21-2019, 06:32 AM	#3
roastbeef Lieutenant General 11586 Rep 12,726 Posts Drives: E92 M3 Join Date: Nov 2010 Location: Orange County, CA iTrader: (4)	probably. __________________ Instagram; @roastbeefmike
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08-21-2019, 07:06 AM	#4
Dpc2u Major 11503 Rep 1,067 Posts Drives: E93 M3, E60 M5, F15 X5, E46 Join Date: Feb 2019 Location: Middle Tennessee iTrader: (0)	kinda a crapshoot being a couple months. It would be a good idea to put the charger on it overnight when you return before hitting the start button. __________________ E46, E60 M5, E93 M3, F15 X5 IG - @thebimmerhaus
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08-21-2019, 09:34 AM	#5
wyatth Colonel 3549 Rep 2,824 Posts Drives: E90 ZCP Join Date: Dec 2007 Location: Bay Area iTrader: (0)	Id be surprised if it cranked, let alone had any accessory power.
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08-22-2019, 08:56 PM	#6
alee0729 Lieutenant 175 Rep 586 Posts Drives: 2013 E92 M3, 2018 Tesla 3 Perf Join Date: Mar 2013 Location: New York, NY iTrader: (0)	2.5 mo is about as far it'll go assuming a reasonably fresh/new battery. __________________ 2013 E92 M3 (the weekend good weather car), 2018 Tesla Model 3 Performance (the 20k mi/yr beater)
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08-22-2019, 09:44 PM	#7
tooloud10 Captain 767 Rep 849 Posts Drives: '08 M3 convertible Join Date: Mar 2017 Location: USA iTrader: (0)	I've let mine sit almost two months and it started, but it all depends on the state of the battery when you park it. __________________ M3 - X5 - 911 - Miata - Raptor - Edge
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08-22-2019, 09:54 PM	#8
cjm41 Lieutenant 753 Rep 498 Posts Drives: 2010 E92 M3 Join Date: Sep 2018 Location: Southern California iTrader: (0) Garage List 2010 BMW M3 [0.00] 2014 Land Rover LR4 [0.00]	I left my car in storage for 5 weeks. When I got back to it the car cranked up like I'd driven it yesterday. I'm sure you have to consider variables like age of the battery and temperature in the garage but based on how easily my car started after 5 weeks I wouldn't rule out 8 weeks. __________________ 2010 E92 M3 // IG: @commuter_blue
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08-22-2019, 11:43 PM	#9
sibhusz06 Second Lieutenant 109 Rep 234 Posts Drives: 2011 M3, 2012 X35I, 2007 911 Join Date: Nov 2016 Location: DC iTrader: (0)	Brand new or close to it, the battery should last 2months even with residual current draw, but it will be at its lowest AH/CCA rating. However if you can, it would be better to disconnect the neg or positive cable if you are unable to trickle charge it.
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08-23-2019, 12:18 AM	#10
Bartledoo Driver 2692 Rep 2,714 Posts Drives: 2011 E90 M3 6MT Join Date: Aug 2015 Location: Seattle, WA iTrader: (0) Garage List 2023 Corvette Stingray [0.00] 2002 Porsche Boxster [0.00] 2011 E90 M3 [0.00] 2021 Tesla Model Y [0.00]	I think I had mine sitting for like 5 months over winter with the battery still connected (forgot to disconnect) and it cranked fine. Still running that battery now! It is not a new battery either.
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08-23-2019, 04:51 AM	#11
///M Power-Belgium General 63360 Rep 24,668 Posts Drives: ///M3-E92-DCT Silverstone II Join Date: Jul 2012 Location: Belgium iTrader: (0)	Yes . __________________ "MAX VERSTAPPEN" IS THE 2021+2022+2023 F1 WORLD CHAMPION - #UnLeashTheLion BPM DEV-Tune & DCT Software-Tune & Servotronic & coding ///Alpine HID Angeleyes ///Oem.exhaust mod.
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08-23-2019, 11:19 PM	#12
Jerezblack.m3 First Lieutenant 149 Rep 307 Posts Drives: BMW E92 M3 Join Date: Jul 2019 Location: San Francisco iTrader: (4)	I would just disconnect it.
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09-24-2019, 01:28 AM	#13
kyrix1st Colonel 2362 Rep 2,362 Posts Drives: G87 M2; E92M3 MT&DCT; M3 euro Join Date: Sep 2014 Location: nyc iTrader: (0) Garage List 2004 BMW Z4 [0.00]	Is anyone so anal as to pull the fuel fuse out and crank few times to get the oil pressure? Seems like a good idea for dry starts. __________________ Pass me if you can.
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10-16-2019, 11:00 PM	#14
kyrix1st Colonel 2362 Rep 2,362 Posts Drives: G87 M2; E92M3 MT&DCT; M3 euro Join Date: Sep 2014 Location: nyc iTrader: (0) Garage List 2004 BMW Z4 [0.00]	**Update: The car started fine after 8 weeks! Looks like the car went into deep sleep mode while away. __________________ Pass me if you can.
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08-05-2020, 08:05 PM	#15
kyrix1st Colonel 2362 Rep 2,362 Posts Drives: G87 M2; E92M3 MT&DCT; M3 euro Join Date: Sep 2014 Location: nyc iTrader: (0) Garage List 2004 BMW Z4 [0.00]	It's been 4 months since I last started my 6 speeder...will definitely charge overnight and pull the fuel relay out to get the oil pressure up. For those of you tried, is it the fuse #70 for fuel relay? __________________ Pass me if you can.
	Appreciate 0 Quote