Battery Time Not Lasting?

hi,
refurbished 13 inch i7 2.8 ghz mbp came today, , charged 87 percent had when turned on. started up, , checked time though, said had 3 hours left on it, yet charged.


can explain should next?

 

the reported battery time depending on current cpu usage , display brightness, , fluctuates.

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this should answer most, if not all, of battery questions:
apple notebook battery faq by ggjstudios
the f.a.q. includes following topics:

• battery information
• battery life charge
• ac power
• calibration
• battery lifespan
• checking status , health
• charging
• what cycle?
• batteries not covered
• bulging or swelling battery

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