If your battery was empty already and you need to send an urgent message but you are in the middle of nowhere well here's my trick on how to use the remaining power of your battery. Procedures
1st: Remove the battery. 2nd: From the 4 contacts of battery (the square gold portion above) cover the 2 square contacts in the middle. For a battery with only 3 contacts cover the middle contact with a paper or any thin cover. 3rd: Insert the battery. Now you have atlist 2 bars to 3 bars left in your battery to send and receive an urgent message.