hi, I have a new 7+ here and want to preserve the battery as good as possible. It lasts pretty long, which is nice, but I hate to see it drop under let's say 40% by 4pm because it means that if I decide to go out in the evening I will end up with an empty battery. So I'll receive the apple iPhone dock today and was wondering- if I sit by my computer to work and have the phone constantly on that dock while I take calls and stuff, will this actually help the battery because it'll just use the constant power source like the MacBooks do when fully charged and plugged in? (I remember I read to plug the MacBooks in whenever possible to help the battery last longer). Or will it likely decrease battery life if I constantly charge it??