NoMEM batteries offer the newest frontier in battery technology for power-hungry digital and high performance LCD type camcorders requiring a specially designed Lithium-Ion battery pack. With NoMEM batteries you have longest performance with no memory effect; highest quality Japanese cells; original manufacturer approved protective circuit and 100% compatibility with original equipment chargers.This battery is designed for Sony NP-F550 and is to be used with BCVL11, BCR362 chargers.