Should Battery Life go down after a Calibration?

[sclough]

This is a little strange. I first had one of the June 2009 15" unibodies. According to Coconut, the battery was around 6500 original capacity. After I calibrated it, it went to around 6700 and it gave really good battery life. Then, the anti-glare option came out so I sold that machine at got one of the new anti-glare ones. The original capacity showed 6500 as well, but the current was only 6300 after one battery calibration. So, after using it for a few months, I calibrated the battery again. Now it's showing 6224 as original capacity. Overall battery life is less than my original June 2009 unibody. Sure the battery life is pretty good, but I miss the extra life the first one had.

Is this just a bum battery, or am I missing something?

 

[miles01110]

Is it actually giving you less battery life (as in you've timed it doing some task and compared it with a similar test you performed on your previous unit), or are you just going by the numbers? My capacity reading fluctuates by ±200 mAh on what seems like a monthly basis. I wouldn't read too much into it unless you actually notice something is wrong.

 

[sclough]

The battery definitely doesn't last as long as the first June 09 unibody I had. I don't have scientific numbers to show the difference between before and after calibration, I just noticed Coconut's numbers went down when I expected them to go up a little.