Rick,
At first this seems like a cheap shortcut. However, it gives a lot of flexibility. For example, in addition to what Doug and others have said. You can use a solar panel to charge the built in battery.
Also remember that you have a menu option that turns charging on or off. Just because you have the power cord plugged in does not mean the radio battery is charging.
Brian
K0FBS
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Brian
K0FBS
Brian Smith