MBP battery dropping fast

Hi,
had been browsing hte forum for days and cant really find the answer to my query.
i had my MBP for 6 mth, i'm displaying my batt status in %.
what happen is the % of the battery drop very fast, like less then a min drop to 1%.
In 10 min , it can dropped to 100% to 88% while i'm just browsing the net.

..... and I have a similar problem with my new replaced battery. My Apple reseller replaced my old 17" MBP battery on last Saturday but I noticed a strange effect today. Yesterday I shut down my MBP by 50% and I only had 43% this morning.... yes I alreday calibrated the new battery as described in the Apple Manual. Furthermore, I lost about 20% while I was importing 4 Audio CD's in iTunes. Do I need to replace the battery again? Or do I need to calibrate my battery again?

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