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A baset trailer is a range extending device for use with battery electric vehicles consisting of a battery pack mounted in a trailer. The batteries can be replaced by recharged ones. Most small to midsized passenger vehicles would require 15 to 20 kW. Larger vehicles could require 30 kW or more of power depending on how heavy and/or un-aerodynamic they happen to be.
They can be also used with electric buses: bus companies can store recharged batteries in route strategic points (bus stations, filling stations, parking lots, electric utility facilities, ad-hoc facilities or shops and so on).
In renting, the maintenance costs of baset trailers can be deferred to the lessor or agency. They are can also be given for rent.