Four hours to charge?

The batteries themselves can charge in about half an hour.  The limiting factor is the size of the charger.  That is, how much of a charger do you want to buy and how much of a charger do you want to carry around with you.  At BERI we felt that the 12 amp Delta-Q charger was the best compromise -- and engineering is fundamentally the art of compromise.  However, we build each Spark M4 to our customer's specifications.  If you want a faster charging time, let's talk.  Alternatively, if you know you will only be charging overnight when you have lots of time maybe you'd like to lighten up your ride and save a bit of cash.