The Impact NP-F975 rechargeable lithium-ion battery works in Sony camcorders which are designed to use Sony's L-series battery. Lithium-ion batteries like this, have no memory effect, so you can recharge them any time you want without degrading their performance. This battery is compatible with Sony's InfoLithium technology; the battery communicates with the camcorder to give you an on-screen indication of how much energy remains.