I am loosing like 10% battery during light use. Yesterday morning I unplugged at 8am after charging all night. I browsed a couple sites for ~5-6 minutes. Checked a 3-4 emails and set the phone down. When I left the house at 830 I had lost 4%. At about 530 the phone turned itself off and I charged to 100%. **** it lost ~18% last night while in standby. Should I ask for a replacement battery or a new phone?