Laptop Battery Life Span?

my laptop is about 2.5 years old. it has a 9-cell battery according to a system scan, the battery has 68% (58.83/86.58 Wh) of its designed capacity. I currently get about 3.5hrs use (Brand new i got 7.25hrs.) It holds a charge, for now. What is the recommended percentage to replace L-Ion Batteries? Should... show more my laptop is about 2.5 years old. it has a 9-cell battery

according to a system scan, the battery has 68% (58.83/86.58 Wh) of its designed capacity. I currently get about 3.5hrs use (Brand new i got 7.25hrs.) It holds a charge, for now.

What is the recommended percentage to replace L-Ion Batteries?

Should i buy a new battery (MSRP $190)? i am planning to sell it ($500+, originally $2700) and get a better Laptop by Fall 2012.
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