How should I interpret the full charge capacity (mAh) for a macbook battery? in System Information it shows: "Full Charge Capacity (mAh): 7860".  How should I interpret this figure?
According to Apple:


  Full charge capacity: Measured in mAH (milliampere-hours), this refers to the amount of power the battery is capable of containing, less the energy required to shut down the device. This number lowers as the battery becomes depleted with usage and age.


You didn't indicate your device details so I can't tell you if that number is good or not.  See the Apple Support page for more details.