Need an AC adapter for Dell Laptops/Notebooks with the following model numbers: 5150; Latitude E4200, E4300, E5400, E5410, E6400, E6410, E6500, E6510; Precision M90, M4400, M4500; Studio XPS 1645, 1647? BTI has you covered with our premium 19V, 120W replacement power adapter. This product has been engineered to meet or exceed the original manufacturer's specifications and replaces the original Dell part numbers 87-22S8S-4EC, M22BAT-8. All BTI power adapters are manufactured and tested under our stringent quality standards and come with an industry leading 24 month manufacturer's warranty. BTI... True to the original.