I want my battery icon to remain full as it drains pretty fast after I have updated my lumia 720 cyan to black. I want it to notify me only once 50% of battery has been drained.
Just to be sure, what you're looking for is a way to change what the battery icon in the system try (that bar containing several icons, time etc. along the top)? There's no way to do that, sorry. It's showing the current state of your battery. Kinda confused though, as you're talking about notifications. These come from the battery saver app, but there's no settings that would allow the user to define the threshold.
Or are u referring to the new live battery saver tile? Until recently it wld have updated only once every 30 mins or so and now it shows live battery status.