From one of the many, many pieces of paper that shipped with my 5550:
Quote:
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If the charge on the battery goes below 3.2 Volts as a result of not being connected to the Universal Desktop Cradle or the AC Adapter, no damage will occur to the battery. However, the iPAQ Pocket PC charge adapter will not flash until the battery reaches the minimum charge of 3.2 Volts and you perform a normal reset.
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hth!