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Need a battery for Averatec Laptops/Notebooks with the following model numbers: 3700, 3800 series ? BTI has you covered with our premium 6 cell LiIon battery. This product has been engineered to meet or exceed the original manufacturer's specifications and replaces the original Averatec part numbers 957-N0111P-005, BTY-S11, BTY-S12, NA203110-01. All BTI batteries are manufactured and tested under our stringent quality standards and come with an industry leading 18 month manufacturer's warranty. BTI... True to the original.