[TrouserSnake]

This is interesting to me... for a while I've been reading up about "upgrading" bikes that were designed to run lead acid batteries with Lithium batteries.
The chemistry makes sense, in respect to the batteries operating & charging voltage levels, but I'm not convinced that a small lithium battery has the same damping effect on the stators output as a much larger lead acid battery has.

The damping effect of the battery (its ability to absorb voltage spikes) is very important for a permanent magnet and stator type charging system.
If the battery can't absorb the spikes fully then the voltage peaks get too high and regulator has to fire, when that happens the stator output gets shorted and the battery has to carry it until the next stator phase starts to give sufficient output. This will produce a very choppy DC voltage output which might work ok on a single that has basically no electronics but on modern bikes, with multiple ECU's you are asking for trouble, unless the bike has been designed to incorporate a lithium battery.

I think I will be keeping my lead acid batteries on my 990 and 1190... but for my DRZ400 the next battery (coming soon) will be super capacitor.