Why are the batteries inserted when the Accu-Chek Mobile system is delivered?

The Accu-Chek Mobile system is delivered with the time and date set at the factory. Power is supplied by a 3rd internal battery. During storage a protective foil prevents the 2 AAA batteries losing any power and the settings are preserved using the internal battery power. 

To activate the AAA batteries, pull out the protective battery foil and they will take over from the internal battery.

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