The 74 watt hour inspiron battery of mine is swollen. It has three bulges. Not so big, as the ones shown in YouTube videos, but yeah big enough for a concern. So
NewerTech NuPower 95 Watt-Hour Lithium-Ion Battery for 17-inch MacBook Pro 2011 Laptops
Watts in a Name? Why We're Using Watt-Hours to Compare Batteries | Wirecutter
Watts in a Name? Why We're Using Watt-Hours to Compare Batteries | Wirecutter
How To Estimate Battery Life Of Any Laptop - The Shared Web
Battery MacBook Pro 17" Unibody Early 2009 till Mid 2010 + Tools - 84.66EUR - OWCshop