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Should I Move My Battery To Trunk?


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Hi..... I have a very nice 74 tii with a fatigued battery tray. I am the second owner and very cautious about straying from original design. I have the engine out and the front suspension currently to clean and replace seals.

What is the consensus on value vs handling if I move the battery to the trunk at this time ?

Thank you!


BMW 2002 owner since 1981

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Do what you want. Now is the time to repair/replace the current tray, or move it. It sure makes changing the oil and servicing the alternator easier when it's in the trunk! I didn't notice any handling differences when I moved the batteries of my '70 & '76 to the trunk.

Edited by John_in_VA

John in VA

'74 tii "Juanita"  '85 535i "Goldie"  '86 535i "M-POSSTR"  

'03 530i "Titan"  '06 330ci "ZHPY"


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I recommend it, as I agree with John - oil changes and alternator work is lots easier. 

I also removed the tray and it really opens up the engine compartment. I was concerned about

losing trunk space but found that it wasn't really an issue. 

75 2002 (black) 1990 - 1993

73 2002 tii (malaga) 1994 - 2017

74 2002 tii (verona) 2023 - probably forever

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Yes u will loose originality, no you wont gain handling, think about it.................................lots of time these Qs answer themselves

Happy Trails to u~ Dave Miller
76 Golf~Rhiannon~BM Mascot~*~97 328is~Silver Ghost~*~68 1600~Wisperin Beast~*~70-02~Bumble Beast~*~76 02~Beast~

Keep smilin all the way

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Will this work with a 6 series back seat conversion? I have the seat but not gotten around to install yet and just wondering. Sorry for the hijack





you are going to need an AGM battery anyway as you should not put a regular car battery in the un-vented trunk.  put it under the rear seat.


1995 Toyota Landcruiser

1975 2002A

1989 Dodge Raider (sold)

1974 Toyota Landcruiser (very sadly sold)

1994 BMW 530i (sold)

1992 BMW 325i (sold)

1970 2002 auto sunroof (sold)

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i don't see why it wouldn't.  AGM batteries come in a variety of sizes and can be mounted in any orientation.  for a street car with high power demands you could use a larger one in same location or two in parallel, one on each side of the tunnel under the seat.  out of sight, frees up room in the engine compt, does not take up space in the trunk.


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If it's just the floor of the OEM battery box that's badly rusted you can either

 1.  replace it with a good battery box from a roundie--chisel your old one out; roundie battery boxes bolt in--not welded like squarelights


 2.  measure the floor of the old battery box and have a sheet of stainless steel cut to fit.  I did that on my Renault when the battery holder bottom started to rust out...that was in 1966 and it's still nice and shiny!




'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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You have nice original tii. I would like to have one. Keep it original and fix the tray. It's less work and the gain in handling is not really noticeable. How big effort it really is to take battery out for oil filter replacement? Not a big thing for me.



Racing is Life - everything before and after is just waiting!

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  • 2 months later...

Will this work with a 6 series back seat conversion? I have the seat but not gotten around to install yet and just wondering. Sorry for the hijack


I just swapped to the 6 series seats and had to take the amps out that I had under the bench... so I doubt theres enough space for a battery.


I've been considering moving my battery to the trunk, but I currently have a sub and a home made box for my small parts and supplies I like to carry around. maybe I'll build a custom battery box speaker combo.

Daily '74 BMW 2002 w/ Dual 40's


Visit my Wheelwell to see what I've done to the car


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Old thread, but whatever: I´d move it. Sure the slight gain in handling is nice, but it comes down to this: Where do you spend most time. Working on the engine, right? So it makes sense that you make your primary work-environment as good as possible, right? Who uses the 02 for lugging stuff around anyways? 

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If you are fuel injecting, it is the perfect place for the air filter.


I added an odyssey PC925 under the passenger rear seat and ran the cable on the passenger side coming out of the firewall right under the glove box.  There is a lot more room on the passenger side for everything.



FOR SALE-----74 2002tii 2782194 Turkis, Megasquirt, Korman road sport springs, Bilstein HD shocks, 13" FPS Bottle Caps


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