HT1338 Mac forgets time and date when battery runs flat

My Mac Book Pro forgets time, date and network password when battery runs flat. My software is up to date. The computer is about three years, but surely it shouldn't be necessary to change battery every three years? I have seen others with problem, but no answer yet.

Resetting your Mac's PRAM and NVRAM
If resetting pram does resolve your issue - Apple/About This Mac/More Info/Hardware/Power/Battery Information - copy and paste the information here. Do not include any serial numbers.

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