Lithium Sulphur is still on the back burner, we are still involved though and there are two Sulphur Wisper Alpinos currently running around the roads of Abingdon.
We are now using Samsung cells in all our new bikes, Li Po seems to have slipped back a bit. The new Wispers to be unveiled at the NEC later this month sport 400Wh and 560Wh rack batteries with balanced chargers, both can be interrogated using a BUS connection to a PC. The batteries are being built by the Apple battery manufacturers, amazing quality, real state if the art.
All said we still have Wispers running on 8 year old LiPo batteries!
One of the best improvements recently has been in BMSs, our new Wisper Torque and Kombi batteries will not start their two year warranty until the battery has been charged for the first time, as long as that is within 2 years of manufacture. There will also no longer any need to condition our batteries over the winter, they go into deep hibernation and will last for up to 12 months with out the Voltage dropping to critical.
All good stuff.
I cant see a move to Li Sulphur anytime soon.
All the best
David