2000 Buick LeSabre Custom

Yes you need either a vented battery or an AGM battery that emits no fumes. You don't want sulfuric acid fumes in passenger compartment. Stop by your local Buick dealership for more info.

A little late but the battery size is 78n but you almost always need the premium version, call any place that sells vehicle batteries and let them Know your vehicle year, make and model and they can tell you exactly what battery. I just had to replace mine (04 buick lesabre limited same battery type and location) it was $140 from Walmart and $189 from o’rileys. It’s REALLY expensive for ours but the right size will have the right vent holes and the vent bracket should still be installed under the seat.