I am having battery issues while on ac power, I need some help.troubleshooting to figure out what is going on. While on ac power, I will look and see that my phone is fully charged, while still plugged in, I will use my phone (normal usage, just basic internetting and facebooking) About ten minutes later I will notice that I have lost battery charge and I am around 80%, but still charging. I checked system panel and it all looks normal. I checked battery status and nothing jumps out except for the loss in charge. This has happened a few times already. Any thoughts?