On Tuesday, August 6, 2019 at 7:10:26 AM UTC-5, wrote:
FES has used same Kokam cell for 10 years. Lange has used same SAFT cells for 20 years. There has been absolutely zero advance in electric glider battery technology. Just a reminder.

Just because they are still using 10 and 20 year old cells doesn't mean the technology hasn't improved. It just means they aren't using it.

Mark, it's an often repeated myth that battery technology has improved. In reality, all the e-vehicles from bikes to light trucks and FES or Pipistrel still use LiPo or LiFe chemistry, so do the solar storage systems. Yes, there are new chemistries that compete for future applications but none has even shown up in cutting edge systems such e-remote controlled planes - and those guys don't mind the occasional fiery crash. Please show me one commercially USED battery type that is substantially beyond the current 200 WH/kg..