Isn't the battery life much better in laptops which weigh more?
Or is the extra weight because of bad design?
Have you compared the battery capacities of the laptops?
Also if a laptop does not have DVD Drive, weight would be reduced a bit.
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Not necessarily true especially in case of gaming laptops as they need space for the cooling system.
Some gaming laptops have good battery life (5-6 hrs), like Dell 5577, 7567 & 7577, even upcoming Dell G series. They have a bigger battery than rest & my guess is a power efficient display. Dell 7567 had the best battery life for a gaming laptop in that budget, but then Dell realized it was far too ahead of competition & reduced battery capacity to put a GTX 1060 Max Q in its successor, 7577.
My 2 years old laptop doesn't have a DVD drive & yet weighs 2.7 kg due to the large battery & cooling system.