Hey, I have had this MBP for around 18 months now. The battery has roughly 670 cycles, it's current health shows around 76%. The big issue is that during the past month, I got from bad to worse. I haven't seen the 10 minute warning to plug in the adapter for ages. A month ago it used to show that and almost immediately shut down. Then it went to shutting down when 15% charged, and now, if the charge reaches 66%, it shuts down. System profiler shows Charge Information: Charge remaining (mAh): 3416 Fully charged: No Charging: Yes Full charge capacity (mAh): 4778 Health Information: Cycle count: 669 Condition: Good Battery Installed: Yes Amperage (mA): 2307 Voltage (mV): 12194 What should I do?