Lead acid and lithium ion isn't ready for the mainstream yet. No wonder these electric bikes make no financial sense whatsoever.
Best to wait for lithium air technology or something along similar lines, which will take years, if not decades to hit the mainstream. Till then, burn gasoline and enjoy the mechanical, almost magical 'clockwork' of an internal combustion engine!
It's truly a marvel, IF you've the eyes to see it, that is. Roald Dahl has put it beautifully:
'A petrol engine is sheer magic. Just imagine being able to take a thousand different bits of metal... and if you fit them all together in a certain way... and then if you feed them a little oil and petrol... and if you press a little switch... suddenly those bits of metal will all come to life... and they will purr and hum and roar like an animal... they will make the wheels of a motor-car go whizzing round at fantastic speeds...'
Oh well...