Practical for what?
If you want to commute less than 20 miles or so through towns and citys at 30mph or less every day then there are practical electric motorbikes. If on the other hand you want to scream up and down the motorway at motorway speeds for more than an hour then you are out of luck.
Having ridden a ebike for the past year and a half (due to an acute awareness of rising costs and falling wages (and I include the rising cost of insurance, tax & mot not just fuel) I am starting to change my expectations of what a practical electric vehicle is. It is one that full fills a need, a specific journey, in my case, the commute, rather than a replacement for a 'drive for hours and fill up in minutes' liquid fuelled car. I suspect it will be a long time before electric vehicles can provide that kind of convenience without relying on internal combustion.
In the mean time, for me at least, the convenience of conventionally fuelled vehicles is reserved for long journeys.