The Focus Replacement Rechargeable Lithium-Ion Battery and Charger combo replaces the Sony NP-BN1 battery pack. Never run out of power when you're on the go with extra power within reach when you need it most. This high capacity lithium-ion battery can also serve as a spare, essentially doubling your shooting time. Replace your lost or dead battery, or get the most out of your photo sessions with the additional power of the NP-BN1 Replacement Lithium-Ion Battery from Focus Camera!