activate backup battery in nokia phones?

How do i activate the emergency battery in a nokia mobil phone?

Cool Guy
Imagine your cell battery is very low, u r expecting an important call and
u don't have a charger. Nokia instrument comes with a reserve battery.

To activate, press the keys *3370#, your cell will restart with this
reserve and the instrument will show a 50% increase in battery. This
reserve will get charged when u charge your cell next time.

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