Speed Passion ESCs also have variable cut off voltage.
I am looking at LiFe as I'm not and never have been happy with the way LiPo delivers it's power ... I'd much rather a softer power delivery from the cells and motor up to get the same speed personally.
As soon as LiFe is a viable option for me (i.e. good quality saddle packs easily available from major sources) I will move over. Can't wait to get rid of LiPos if I am honest for the same reasons the touring car boys, and some off roaders, went to 5 cell NiMh!!!
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