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FIRST should consider allowing the use of a small secondary battery to power the radio should it lose connection with the VRM/PDP. The battery would be used exclusively for the radio and prevent any reboots due to power loss or brownouts elsewhere on the bot.
Consider that batteries and the PDP are generally well-hidden on the bot (the battery to lower CG and the PDP to shorten total wire lengths. However the radio needs good clearance from metal and motors to ensure a solid RF connection, leading to longer wires and generally less secure mounting (subject to more vibrations potentially). This all introduces risk of wire/connector failure. Allowing a small battery placed alongside the radio as a parallel backup would be beneficial.