After buying the Panasonic SD900 I realised I would need a second Battery & I'm glad I bought this one, the same as originally supplied, as due to the Camcorder having a viewfinder as well as a screen the larger version sticks out from behind the unit and makes the viewfinder (my preference in use) harder to use and not as comfortable, Amazon's price was another factor as it was much cheaper than going to our local retailer - delivery, although the Battery came well within the time limits given I find this "3 to 7 working days" business a bit of a bind as I am sure many will who have to make arrangements to have goods received at home. There is not a lot you can say about a genuine Panasonic Battery other than it is 100% compatible and not likely to damage your valuable Camcorder.