Electric primers? Just brainstorming the possibilities...

Suffers from the same basic problem of gasoline vs. electric cars - a kilogram of a chemical fuel (gasoline, nitrocellulose) has *way* more energy than a kilogram of battery (on the order of one hundred times more). So 50 grains of powder (about 3 grams) carries about about the same amount of energy as 300 grams of a high performance battery. So your battery pack would weigh half a pound or so for each shot's worth of stored energy.

(Whoever figures out how to make batteries about ten times more energy-dense than they are today, will get very rich....)

There still is a certain elegance to burning chemicals, eh...?
There are certain dangers that come with high energy density batteries. Take a look at what can go wrong with Li-ion batteries, and multiply that by a factor of ten or more. Most people won't be aware that they're effectively holding a stick (or several) of dynamite in their rifles if we're able to make very high energy density devices.

Same thing with laptop batteries. Imagine the madness of airport security once they discover you don't have to try to light your shoe on fire, you just have to cause your battery to self-destruct. (Mind you, that'd be harder with sophisticated devices, but if it can happen by accident, it can most definitely happen by intention.)
 
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