unfortunately one of the unintended consequences of the mainstream media publicity ebikes are getting is that this is unlikely to remain the case for long.I have been thinking about this for a while.
I asked my supplier, and the replacement value of a battery is £200..so it is definitely worth a form of security.
I think the current security that I rely on, is that of the mysterious image of pedelecs. I think a lot of people don't really know what that large block of battery is, let alone if it is valuable.
There is already a report of a poster in SW England whose new Wisper was vandalised (in such a fashion that would maybe imply the attackers knew it was an e-bike) - another post from Frank of Powabyke reporting the theft of a brand new demonstration model from outside their business premises.
I keep my bikes inside locked buildings at all times if I cannot watch them at all times. Luckily my friends and my employer are equally cynical and mistrusting of strangers (especially with a deepening recession and lots of desparate people around) and don't have an overoptimistic view of East Anglia (which still remains a fairly good place to live in nevertheless compared to London or SE England).
its worth sharing the solution for the benefit of all, it may also help the good people find potential flaws before the bad people do...