I have an iPhone 4 and an ipad 3,both on 6.1.2 and I have some questions that are killing me 1. If my ipad or iPhone has battery less the 10% or less then 20% ,if I charge the ipad and let it charge until 7 in the morning,that means about 8 or 9 hours, is my battery going to be affected? 2. If I use the ipad while it is charging,is the battery going to be affected or get worse? 3. Do I need to use an app from App Store,like battery doctor? And if yes,will it get my battery better? These are my 3 questions,both for ipad and iPhone,please don't ignore me and answer if you know right,not if you asume and you are not sure,this is really important to me.