I have mine on the top tube and the bottom tube. If you cannot fit it in the triangle I would do top tube over the rear rack. There is also the option of two hanging compartments over the top tube to either side. Big ebikers do this for big battery builds.I planned on using 3 and the other on my gas bike for lights. I made a little box that can hold 3 batteries like a rear rack but i was thinking of other areas to put them. Maybe 2 under the front basket and 1 somewhere else?
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