For the last 2 days I've noticed my battery stops charging at 79 to 80%. What happens is I let the sp2 charge for a while when down to about 10-15% then when I restart the battery is at either 79 or 80, says its plugged in but not charging. I read on another post here that using the power button with the + volume to reboot solves the issue, but it did not work for me. Is my battery REALLY wearing out after 2 months with the sp2? I only charge when the battery is below 20%. When fully charged it usually lasts me from 8am to about 5 pm but today it gave me a warning at 2pm but won't fully charge. Any ideas? Would hate to exchange this machine which, other than this issue, has worked almost flawlessly.