Under-Seat Battery Relocate - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 48 (permalink) Old 11-19-2020, 12:08 PM Thread Starter
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Under-Seat Battery Relocate

Playing with my new-to-me '08 and noticed the battery was perfectly sized to sit in the largest under-seat compartment, so moved it yesterday. *The FJR's battery was an AGM that had "Do Not Tilt" on the back, so used the sealed battery from my '06 FZ1 that was considerably thicker, but still fit. A sealed FJR battery would fit even better.

Didn't find any other posts on this, so snapped a few pics.

It was an experiment so I didn't cut cables, just extended them, didn't alter anything permanently. Made sure to pad the battery and extended the stock rubber tie-down strap with an o-ring.

Didn't even remove the tank, just slid the extending wires down the right side. Next step would be to professionalize the connections and wire routing.

Made a fourth plastic "wall" so the stock battery box is now a sealed storage unit, and then replaced the screw and push-pin fasteners on the stock battery box beauty panel with finger fasteners for quicker access...used a 6mm contained nut on the lower push-pin hole.

Won't pretend that I moved it because of "mass centralization" or anything that esoteric...I'm sure it helps but mainly I moved it for easier access and less fiddling with electrical connections. Plus, it's fun, creates an accessible storage unit, and the under-seat tray seemed to scream, "put the battery here where it belongs!".
Attached Images
File Type: jpg battery 2.jpg (213.0 KB, 79 views)
File Type: jpg Battery 4.jpg (168.7 KB, 49 views)
File Type: jpg Battery 1.jpg (189.0 KB, 51 views)
File Type: jpg Battery 3.jpg (138.4 KB, 50 views)
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post #2 of 48 (permalink) Old 11-19-2020, 02:18 PM
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That's awesome. Wonder why mama Yamaha didn't do that to begin with ?

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post #3 of 48 (permalink) Old 11-19-2020, 02:56 PM
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I like this conversion for the accessibility but I'm thinking it will stay cooler where Yamaha put it.

Last edited by justacrossthehill; 11-19-2020 at 03:02 PM.
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post #4 of 48 (permalink) Old 11-19-2020, 04:30 PM
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Some of the FJR Police bikes have the 2nd battery(for all of the additional lighting and radios) under the seat similar to what you did with yours
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post #5 of 48 (permalink) Old 11-19-2020, 05:39 PM Thread Starter
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Temp...

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Originally Posted by justacrossthehill View Post
I like this conversion for the accessibility but I'm thinking it will stay cooler where Yamaha put it.
Agree...and didn't even think of battery temp. The FZ1 battery is wedged into the under-seat components but wrapped in a full-circumference heat cloth...I'm going to monitor the temp on the FJR and might replicate the heat-cloth wrap if needed. Will know more soon as it's riding weather in CO today and I'm off for a "test".
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post #6 of 48 (permalink) Old 11-19-2020, 07:21 PM
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Well done!

There are countless numbers of motorcycles on the road with the battery mounted under the seat and over heating does not seem to be an issue.
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post #7 of 48 (permalink) Old 11-19-2020, 09:05 PM
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You did a good job of it, for sure. I get it, but on a Gen2 the battery is easily accessible... Gen3 is more fiddly, Gen1 maybe too but I have limited experience there.
You have to remove both seats to get to the battery, really any time savings on Gen2? I'd rather have the underseat storage, but that's my opinion. I keep stuff there.
So what's the original battery compartment going to be used for?

Ray
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post #8 of 48 (permalink) Old 11-19-2020, 09:10 PM
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He added a wall and made a storage compartment

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2018 Yamaha FJR 1300A
2014 Honda CB1100 DLX

It doesn't matter what I ride, where I ride, how fast I ride, or how far I ride... it only matters THAT I RIDE...EVERY DAY. "Ferret"
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post #9 of 48 (permalink) Old 11-19-2020, 09:45 PM
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True, a lot of bikes have the battery mounted under the seat but the FJR has a thick heat shield over the engine to restrict the upward flow of heat. My question is if it can't go upward then where does it go? If the bike is moving forward the heat isn't likely to go forward, and due to the nature of heat, it isn't likely to move downward so what is left? Yamaha put a big open area there for some reason.
This is pure speculation on my part and is probably totally wrong but that's the way I see it.

Last edited by justacrossthehill; 11-19-2020 at 09:51 PM.
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post #10 of 48 (permalink) Old 11-19-2020, 10:53 PM
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Quote:
Originally Posted by justacrossthehill View Post
True, a lot of bikes have the battery mounted under the seat but the FJR has a thick heat shield over the engine to restrict the upward flow of heat. My question is if it can't go upward then where does it go? If the bike is moving forward the heat isn't likely to go forward, and due to the nature of heat, it isn't likely to move downward so what is left? Yamaha put a big open area there for some reason.
This is pure speculation on my part and is probably totally wrong but that's the way I see it.
Yep, totally wrong. Natural convection occurs in nearly static (non-moving) conditions. Heat WILL readily move downward when the bike is in motion- everyone with a heating system in the attic will confirm this.

Russ
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