Basically wondering if it would be possible to mount a battery on the underside of the down tube on this bike. I’d rather not have it on a rack on the back if possible. There does seem to be enough room even after shock absorber compression but no real way to secure it. Also, the tubes are wider and somewhat oval and there is not room near the rear hub for an upright rack mount. Trying to figure out a way to do this. I am good with tools materials, and mechanically capable. Thoughts? Thanks so much!