Have the battery with a Sony original battery for over 2 years in use for Sony Camcorder HDR-CX520VE, also use additional lamp / LIGHTNING or external microphone with power supply via the Active shoe from the same battery. No problems with the device, it holds a charge well over weeks when not in use. Also discovered no disadvantages when loading. Processing and quality perfectly. Highly Recommended. How does Sony merely their own batteries ago, so they cost many times?