2 hour battery life out the box

My XPS 9550 4K Infinity Edge 1TB HDD 32 GB SSD 16 GB RAM NVIDIA 960M arrived today.

I was aware having read reviews that battery life would be poor, but on the lowest screen brightness I'm getting an estimated 2h 5 mins battery life remaining from full charge.

Is it typically that bad?

Also, I'm tempted to do a fresh Windows install as I've read this is a good idea.

Will this help with the battery life? Can someone link me to a guide on how to do this? I've seen a few floating about but not sure if they are suitable for all XPS 9550 models.

Thanks in advance.

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2 hour battery life out the box