Expandable handsets lose activation:
USer manual requires,
full charge 16 hours for expandable handsets, then place in cradle ~20 seconds until 'ready' is displayed on the screen.
If power is lost the handset may have to be re-registered.
if the units are not fully charged when you register them the registration may be lost, can only suggest reversing the order, by fully charging the device then registering to see if the registration holds
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