I haven't done any real tests so I guess I'll defer to you on that. It's been more than three years of daily use since installing the laptop battery though, so I'd say the fact that I haven't noticed a significant drop in battery life means that $50 is no less then a fair price.

Ok I just looked up oem, damn I'm cheap lol: https://www.dell.com/en-us/shop/dell-6-cell-97-wh-lithium-ion-replacement-battery-for-select-laptops/apd/gpm03/pc-accessories