I have a 15" MacBook Pro 3.1 (that is Late 2007 model AFAIR). I've bought it new a couple of years ago.

Recently its on-battery power lifespan became very short (30 to 10 minutes).

When my notebook turns itself off due to "low battery" and I press the small button on the battery itself, all LED lights are alight, indicating full charge.

When I plug in the power adapter, my Mac displays that "battery is fully charged, finishing charging process" (I have a Russian OS X 10.5.7, so that is a rough translation), but the LEDs on battery itself display (seemingly accurate) status that there are one or two "LEDs still not charged".

My battery have as few as 37 recharge cycles (yes, I've neglected calibration over the time I've used it). Battery info programs like iBatt2 report battery capacity of 65 337 mAh (with by-design capacity of 5600 mAh).

I get it that something went wrong with battery electronics.

I've tried resetting my Mac's PRAM and SMC, it did not changed anything.

Now I'm trying to recalibrate the battery, but looks like it does not help as well. Will try to recalibrate it several times in a row.

I'd buy a new battery if I knew if it is battery fault, not a notebook's.

Any suggestions?

Update:

After recalibration, my battery status now displays battery capacity of 1500 mAh. But with every recalibration (or simply when I use notebook without power adapter plugged in) this number changes in the range from 200 mAh to 1700 mAh.

LEDs on battery now are synchronous with what nodebook thinks on the charge level.

Also I've noticed that cycle count changes rather slowly. It is now 39, it was 37 when I've started recalibration, and I went through the process at least ten times...

So, the main question is: does it look like that replacing the battery would help me (or does it look like this is notebook's problem)? I guess I should try replacing the battery.