终端使用命令：

ioreg -rn AppleSmartBattery | grep -i capacity

得到电池信息：

"AppleRawCurrentCapacity" = 976     
"AppleRawMaxCapacity" = 3534
"MaxCapacity" = 3534                //最大容量
"CurrentCapacity" = 976             //现有电量
"LegacyBatteryInfo" = {"Amperage"=18446744073709550290,"Flags"=4,"Capacity"=3534,"Current"=976,"Voltage"=10903,"Cycle Count"=468}
"BatteryData" = {"PMUConfigured"=1204,"FccComp2"=3534,"ResScale"=117,"SystemPower"=1096821353,"Qmax"=(4596,4338,4477),"DesignCapacity"=5088,"CellVoltage"=(3633,3634,3636),"PassedCharge"=18446744073709551541,"RaTableRaw"=(<0000009e008c0097008f00a00084007f00880089009800b800e8017e029b0406>,<005500c700920092008a009b007000780082008e009700b5010f0177036a0544>,<000000c2009700a4008a009e007f00840092008e009f00be00f8016b028b03d2>),"StateOfCharge"=28,"PresentDOD"=(66,69,67),"Flags"=666370561,"DataFlashWriteCount"=5264,"DOD0"=(10944,11456,11136),"ChemID"=6262,"AdapterPower"=0,"CycleCount"=468,"Voltage"=10937,"GaugeFlagRaw"=192,"FccComp1"=3746,"BatteryState"=<000000000000000043e400024a000010>,"ManufactureDate"=59585023981106,"LifetimeData"={"TotalOperatingTime"=33995,"UpdateTime"=1656987793,"AverageTemperature"=1,"TimeAtHighSoc"=<940100001b2b0000a210000000000000>},"Serial"="F8Y8334A3MFJ7PYAU"}
"DesignCapacity" = 5088     //设计容量