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      04-27-2026, 07:25 PM   #1
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Drives: 135i 2013
Join Date: Jan 2018
Location: Canada, Saskatchewan

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Battery Relocation Mod (for quad exhausts)

I managed to fit an H6 Battery in the passenger side boot and deleted my battery tray to make room for my quad exhaust. I simply cut a piece of aluminum for the battery tray by tracing it and bolted the charcoal canister to the subframe. I decided to do this because the price of the 1m battery conversion is now absurd in Canada and the cost of this job was probably sub $50 minus the battery (excuse the dirty trunk i spilt sand).

Some points if you want to replicate:
-H6 is the absolute maxiumum size of battery that will fit, if i did it again id go smaller, i used the stock mounting bracket.

-You have to reroute the charcoal canister lines or secure the canister in place with a custom bracket, use good flexible fuel hose and clamps (it's just vapours going through the lines so it's not rocket science).

-You either have to extend the battery cables over a foot or be willing to drill two holes in the underbody to connect the battery (use paint/rubber to seal).

-I added some soundproofing on the aluminum panel because it was too thin.
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