The support does the job, nothing more. However batteries "offered" bonus are lousy quality. Do not offer and lower the price of your support, it will be more honest. One of the two has never worked and the other holds (weather permitting) half day. Despite the interventions of Amazon services, it is impossible to form a ship battery exchange service! must return the pack and wait (with no guarantee of better quality) sending another ... Cease fire, I keep my batteries for recycling and pass my way the next time a product will be offered me Mondpalast .