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[domingo3]

  Does Zero share anything about their power reduction algorithms?  I've only had my FXS for a few months, so I'm still learning how it behaves.  I've noticed a dramatic lack of power a few times now when my SOC was in the mid 30s and I was trying to accelerate from a speed of about 65 mph to merge.  Not having the power that I'm accustomed to, I had to alter my course and slow behind a car instead of pulling out in front as I had planned.  It would be nice to be able to better predict when the bike's performance will be limited rather than having to react. 
  I know the FXS isn't the bike of choice for high speed freeway riding, and I use it mostly on smaller roads for commuting. I do try to ride it whenever I can, which sometimes calls for a few miles at higher speeds.

[BrianTRice@gmail.com]

I'm unsure about the FX/FXS, but general consensus I've heard is that cutbacks happen when any cell's voltage goes below a certain threshold.

[acacia1731]

My 2015 FX definitely feels strongest at 100%, drops noticeably below 40%, and is probably cut in half by the time I reach 20%.  I've only gone to empty once, when it completely stalled/died at 8%.

Here's more discussion on the topic...
http://electricmotorcycleforum.com/boards/index.php?topic=4628

[grmarks]

On my 2015 SR if I ride at 100km/h I don't notice any cut backs in power until I get down to 3 or 4%. BUT I have discovered at about 50% top speed starts to get limited. At about 20% you can't go faster than 120 km/h (from memory) but you can still accelerate to this speed quickly. Even at 10% I can still do 100km/h and accelerate quickly. At 3 or 4% I can't do 100km/h and it feels like its in eco mode.

[MrDude_1]

My 2015 FX definitely feels strongest at 100%, drops noticeably below 40%, and is probably cut in half by the time I reach 20%.

Here's more discussion on the topic...
http://electricmotorcycleforum.com/boards/index.php?topic=4628

alot of that is not power reduction... its the battery at a lower level.
the power reduction doesnt kick in until its almost empty... then the voltage is kept above a threshold by limiting current draw.

[buutvrij for life]

There are also thermal cutbacks. When the motor or battery gets to hot things are getting limited.
When the soc is very low the batterytemp will rise more quickly when you ask for a lot of current.
It's a matter of protection for the cells in more then one way.