Need a battery for Dell Laptops/Notebooks with the following model numbers: 10, 10v; BTI has you covered with the premium 6 cell LiIon battery. 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 batteries are manufactured and tested under the stringent quality standards. BTI... True to the original.