Batteries (yes it's a little banal, but vexing me at the mo’)

My reliable source for all things electronic (yes, Stephen) informs me that China is leading the way developments of way-out-there fantastic lithium batteries. If so, then no one has told the Chinese. We have been scouring Beijing all day, chasing possible leads, making calls to battery suppliers & manufacturers but generally getting no where. At long last we managed to get something, although it remains to be seen if they are up to the -30 °C freezer we are about to enter.

P.