How to solve battery low problem of mobile phone

MANY TIMES YOU FACE PROBLEM OF BATTERY LOW Your Mobile Battery is Very Low & you are expecting an important call BUT you don't have a charger" what to do? Nokia instrument comes with a reserve battery. To activate the battery, the key-in *3370# your cell will restart with this reserve and your instrument will show a 50% increase in battery. This reserve will get charged when you charge your mobile next time.