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one or both of the extension mic has got some connection issues. I have had similar problems. The fix is to get some electrical contact aerosol cleaner and the extension mic and spray in to the connection holes. failing this you will need to remove the knobs and the screw rings beneath the knobs and Arial then prey the pc board out. from the bottom .NOTE make sure the speaker connections hole is clear of the body . then open it up NOT TO MUCH there is a thin tape wire connecting the front ... to exposes the connections giving it a bit more cleaning and you should be good .
The battery is readily available online or through any Motorola 2-way radio dealer. You can use part number NTN8971 or NNTN4190 NiMH battery. The phone should also accommodate 4 AA batteries instead of the NiMH battery. (Be certain to never try charging the phone with the AA batteries inside, as it is not designed to do this.)
The wall charger part number NTN1680 is listed as being no longer available from Motorola Solutions. However, during a Google search it appears several vendors still have these available for just over $7 US dollars.
The i550 was a primary phone used in the iDEN Nextel system. It operates on 800 MHz and likely needs to be connected to a system to work. I do not know if it will work as a 2-way radio without being connected to a system. The type of system these were used on has been completely or for the most part shut down. According to this article it will be completely shut down by June 2013. http://www.computerworld.com/s/article/9227557/Sprint_to_shut_down_Nextel_iDEN_network_next_year
Take out the battery and set it aside then using a penny or a piece of wire, connect the prongs on the phone that touch the battery to make the connection with the battery. Hold that connection for about 10 seconds then reinstall the battery. Just to clarify, you are perfoming this procedure on the phone it self and NOT the battery. What this does is it resets the phone back to it's factory set operations. If problem persists then you have probably contracted a virus (yes phone viruses do exsist) and there is nothing you can do.