Left Joy-con drains its battery much faster than the right one?

Hey guys,
I‘ve had my Switch for approximately two weeks now (and I love it so far!). The only thing that strikes me as odd is that every single time the Joy-cons run out of power, the left one dies first while the right one is still sitting at half or even 3/4 charge, according to the battery indicator in the controller menu. (Even though they always charge at the same time - on the docked console, whenever one of them runs dry.)
Has anyone else experienced the same issue or do I just have a faulty battery in mine?

I think it's normal. Mine's like that. Not just on one pair but it happens pretty much in every pair that I own (Gray, Neon red/blue, Neon yellow, Neon Pink/Green, Red-Mario). They don't usually drain at the same time and it's usually the left joy-con that drains faster than the other.