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Actually Hymie you can either lease the battery or buy it, these days. It actually works out cheaper to buy it, and whether you lease or buy it, once the guarantee period of the battery is finished, you have to buy a new one yourself anyway as and when it conks out.
We’d read all the stuff about safety, which if I’m right, seems to be more about the safety of someone you may bump into rather than your own safety as the driver. Could be wrong though.
Thanks for all the comments, always interested in others opinions (even those about chefs knives ;o) )