I wanted a spare battery for my new DCR-SX45E Handycam.
As I'd previously been looking at Panasonic camcorders but was put off by the high cost of their replacement/spare batteries, I decided that £27 or so wasn't a bad price for a genuine Sony long life spare.
The first time I used it I'd had a day out at an air show/ 40's day so found plenty to point my camcorder at. I had recorded about an hours worth, & I viewed it on the way home on the camcorders lcd screen, so after recording, then viewing about an hours worth of stuff, the indicator said the battery was still half charged, I think this thing could keep you going all day, great stuff!