Currently Being ModeratedNov 24, 2012 8:28 PM (in response to Lena_cheena)
Many people who have upgraded from Lion to ML have experienced battery issues. You can find it reported on here: https://discussions.apple.com/thread/4135250?start=2865&tstart=0 .
One solution that may work is to reinstall ML using the combo pack: http://support.apple.com/kb/DL1581. Some people have had some success with that (depending on which MBP you have).
If your MBP is only lasting a couple of minutes, you could have a battery issue. Try Coconut Battery or Battery Health Stats (or some tool like that) to see what type of capacity / battery life you have.
Personally, I have dropped back to Lion until 10.8.3 comes out and I see what the reports look like. Actually, I noticed some othe quirks with ML, so in reality, I'll probably just stay on Lion.