If you're expecting a call and your battery icon starts blinking, the first thing you should do is find a charger. But if that's not an option, here are ten things you can do to hang on. We'll skip the usual tips about the 'memory effect' and which battery type is better NiCd or Li-Ion because you don't really have a choice in that. Close Background Applications If you're using a Smartphone, close applications that you don't need. Applications that stay active in the background use up a bit of CPU, which uses up battery. Make sure you 'exit' the applications from the menu, not by pressing the 'End' key, as that merely puts the application in the background. In Series 60 Smartphones (mostly Nokias), hold down the 'Menu' key to get a list of all applications running in the background to close them. In Windows Mobile 5 phones, open the 'Memory' application and check the 'Running programs' tab to close them. Turn D...