This is how to reset SMC on most modern Mac laptops, none of which have a removable battery:
Shutdown your MacBook Air / MacBook Pro
Connect the power adapter to the Mac
On the MacBook / Pro’s keyboard, hold down the Shift+Control+Option keys and the Power button at the same time
Release all keys and the power button at the same time – the little light on the MagSafe adapter may change colors briefly to indicate the SMC has reset
Boot your Mac as usual
When and How to Reset Mac SMC (System Management Controller)
https://support.apple.com/zh-cn/HT201295
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