Observing the battery designs between the P3 and P4

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I see the P4's battery has little vents on the sides to help with heat ventilation while the P3's doesn't. The thing I noticed is when I'm looking at both done on the inside of the battery compartment is that the P3 has vents where it looks like some of the heat from the battery can escape. Meanwhile, looking at the P4 battery compartment looks to have zero chances of heat escaping from the battery because there are circuit boards on each side of the battery.

So I wonder why did DJI put these vents on the P4 battery when there's no room for the heat from the battery to escape? Yeah, I'm sure the battery vents help some while they are being charged but everyone knows most of the battery heat comes from when it's being drained inside the AC.
 

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