I have problem with my battery

hello. macbook 2.4 2008 late (upgrade Lion) 4Gb Ram
i have problem with my battery cause i used 4 years... and i check that the count down time is wrong onces is 2:10 and the next minute is 1:45
so i buy a new one.. and i check that again i have the same problem.. where is the real problem?

Try doing a SMC RESET.
see if that sorts it out for you.
good luck

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