battery capacity worries

hi - got this little utility "capacity meter" for the battery of a 17" PB

am a little worried that after 3 recharges the battery status is already down to

92 %

how come?

or is a lower-than-100-%-capacity intentional?

tks for any feedback -

92 percent of what it originally was (of the original 5800 units).

whereas it says battery capacity at 92 percent is still "excellent".

anybody else with this utility and similar data?