The Segway batteries are "purpose-built" soley for the Segway. At least I haven't seen any other applications using the Segway battery technology.
Others generally develop electric mobility products around existing battery platforms. That just wasn't really an acceptable option for Segway for a variety of reasons.
Unless they figure out a way to increase the number manufacturered, either by greater production or licensing to others (or both), I wouldn't expect much in the way of price reduction of the batteries.
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