Guys, i think the battery of my macbook 5.1 unibody is giving some problem. Few months back, when i wanted to use the macbook without the magsafe, the battery status shows 99% at the time when i disconnected it from the power point and apparently, i just use it for like 20 minutes or so and it just shut down by itself for no reason. I wasn't unable to power it on immediately but was able to do so after i reconnect it back to the power point with magsafe on and it shows me 78% batt life... Initially i was thinking if it was just one off incident, but no, my subsequent attempt to use it without magsafe resulted in the same shut down to occur. Just now, i've encounter it yet again, so before i posted, i have already read through all available forums, performed battery calibration, resetting the SMC and etc. I followed the instruction here, and the battery condition show "CHECK BATTERY" via system profiler Anyway some info of my macbook: Early 2009 model (about 26 months old) 2.0 Ghz core 2 duo 2GB ram no more warranty Battery INFO: Model Information: Manufacturer: SMP Pack Lot Code: 0000 PCB Lot Code: 0000 Firmware Version: 002a Hardware Revision: 000a Cell Revision: 0100 Charge Information: Charge remaining (mAh): 2862 Fully charged: Yes Charging: No Full charge capacity (mAh): 2895 Health Information: Cycle count: 140 Condition: Check Battery Battery Installed: Yes Amperage (mA): 0 Voltage (mV): 12391 My question is do i need a new battery?