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The battery maintains what you have in memory, you do not have static storage on WM4.21. When the battery runs down, everything that is not stored in ROM is lost.
I am not aware of a way to upgrade to WM5 on your unit. Because the unit is relatively old, your only recourse is to upgrade to a WM5 or newer (WM6, WM6.1) device.
Why not leave it on the charger when you are not using it?
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