Anywhere you likeIndeed......BUT 2 years down the line where do you get replacement battery.
You can ft ANY battery to ANY bike, as long as the voltage is compatible. You might need to replace a connector and get creative with mounting (nothing a few zip ties and some epoxy can't sort) but it's always possible.hopefully you're right about the battery situation as I have a Fast4ward Edge and I'd hate to think it will be obsolete in a couple of years. Great little bike, by the way.