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I did my mods based on this video: Source: http://forums.whirlpool.net.au/archive/2192653#r47152735 Some images from my bike: Speed controller, red, black and yellow from the battery: I cut the red (+), and soldered on connectors to connect my battery in series: Battery connected...

The higher voltage also increase torque and power a bit, its even more eager on the two highest assist levels now :). Is the reduction in torque noticable on the US motor compared to EU stock? Since I have increased the voltage I do sometimes put my hand on the motor at the end of the trip to...

BH Evo 29er owner here. I ended up going the other route, a booster battery connected in serial. From testing: I put it in a frame bag when I use it now: I am using one of these batteries (2S / 7.4V 12.8Ah): (Link Removed - No Longer Exists) I've used it for about a year now, no problems...