High-Performance AP19B8M Replacement Battery for Acer Swift 3 & TravelMate P4 Power your productivity and creativity without limits. This brand new, high-capacity 56Wh Li-ion battery is a direct replacement for the original Acer AP19B8M, engineered to deliver long-lasting runtime and reliable power for your Acer Swift 3, TravelMate P4, and premium Porsche Design Book RS.