I measured the power consumption during sleeping.
With Windows, the sleep(not hibernation) consumes very low energy.
15V 0.08A ~ 1W
However, with MacPanda, it consumes a lot of energy and the board is very warm even when it has been sleeping for 10 hours.
15V 0.3A ~ 5W
The fix is very simple. Just enable C2, C4, C6, and C7 in SSDT section in Clover Configurator.
After this, I got similar energy consumption during sleeping as in Windows.
I measured for 10 hr 12 mins, it consumed 639mAh which equals to 9.60Wh.
Hope this helps someone choosing battery capacity for LP Alpha.