Super_fast wrote:For the battery I would suggest to simply replace the 2 cells, with 2 other, but lighter, cells. Going back to 1 single cell will require a voltage booster, too much of hassle, especially when you aren't an EE.
Take a look here for example: http://www.all-battery.com/li-polyersinglecells.aspx
The lightest option weights only 0.95 grams. But don't shift to often, because the capacity is only 25 mAh Something a little heavier would be a better choice, for example one with a capacity of 160 mAh weights only 4 grams. For comparision when the orinal cells are of the AA format (14500), the capacity is 900 mAh and the weight is 21 grams a cell. So weight savings with the 160 mAh cells would be: 2*21-2*4=34 grams
And get rid of plastic housing, heat shrink tape is a lot lighter
The 300mAh LiOn batteries weigh the same than the 160mAh ones...so you can reduce the weight 34gr with a 1/3 capacity battery. If the standard battery can survive 1000km, the 300mAh can be a very good option as a race-only battery (much better for cyclocross or TT)
Coloclimber, I'm expecting what you will be able to do...