BATTERIES In particular replacement battery's for Lithium-Ion aka LIB, both of which over-come all the problems that have been encountered with LIB batteries.
Two sorts of batteries have come up recently. Both are described as solid state with much longer lifetimes.PLUS more importantly they don't suffer from major degradation with use, thus have a much longer life.Neither is proven nor passed any testing for commercial use. Both are looking at prices which are half the price of LIB's.
This first one is a Metallic Sodium battery which has 10 times more power than LIB.
Available in two variations :
(1) High powered with 5 min re-charging
(2) High energy with twice the Wh/Kg of Lithium-ion.