Mounting a li-ion frame battery upside down

[egosphere]

Some old full-sus bikes, like the 2002 speciazlied stumpjumper pictured below in the attachment, have bottle-cage mounting points on the underside of the down tube (in addition to mountin points inside the triangle). Such full-sus bikes have too small a triangle to fit a frame mounted "dolphin" battery like this em3ev one (http://em3ev.com/store/index.php?route=product/product&path=35&product_id=161).

But according to this schematic I made (the bike and battery are correctly scaled to one another) the battery could maybe fit under the down tube attached upside down to the underneath bottle cage holder.

Could this work? Has anyone tried anything like this? Is this a good idea? Or maybe that's not strong enough to hold it? Or maybe the front wheel would hit it when the fork compresses? What if you lock the fork? Any thoughts/experience/pictures on this?

 

[presturtle]

Looks like when the suspension is fully compressed, the wheel might hit the battery. I'd get the measurements beforehand, good luck!

 

[d8veh]

A couple of issues I can think of: Those batteries are not 100% waterproof. In the wet, it will get sprayed, so you might want to think about a shroud. Secondly, the full weight and impact over bumps will try and fip the clinch-nuts out. I can't see two 5mm ones being strong enough.

 

[tln]

I've definitely seen one other build thread using the dolphin batteries specifically. But like yours the suspension had to be locked out or shortened which is not ideal.

Something like a 2"velcro strap should be used to carry the weight of the battery, those bottle bosses aren't made for 8lb's on them.

On my bike, the batteries are mounted under the downtube utilling the bottle mounts but with a shorter and wider configuration so the front suspension is not affected at all. It's really ideal for the weight positioning IMO, low and central!