7% battery drop over 6 hours sleep on MacBook?

[Jim Witte]

   Is a 7% drop in power expected for a MacBook battery, or is it  
time to replace it with something?  (and with what - NuPower doesn't  
have any MacBook-type batteries - does Apple get exclusive rights on  
the battery design for a while or something?)  This was reported by  
the battery Menu Extra.  XBattery reports a current capacity of 4.347  
Ah, and I think it's at 295 cycles:

Mochroi:~ jswitte$ ioreg -l  | grep Capacity
     | |           "CurrentCapacity" = 2641
     | |           "LegacyBatteryInfo" =  
{"Capacity"=4350,"Amperage"=18446744073709550179,
							"Cycle Count"=295,
							"Current"=2641, "Voltage"=11501, "Flags"=4}
     | |           "MaxCapacity" = 4350
     | |           "DesignCapacity" = 5020


Jim