Since my Kitkat update on Saturday my phone plays an annoying ring tone (which I'm not even using for any other notifications) when my battery achieves 100% charge. It even comes through in blocking mode (and woke me up last night). I've done a google search and it looks like this can't be disabled without rooting? I can't root my phone (use for work) so need another solution. Tried a battery notification app and disabled sound but it didn't work.