Battery is advertized as Energizer photo battery. It even shows the image of Energizer. Well what you get is a GP battery which is a cheap Chinese version of that.
The other (maybe more) important issue is that the battery is good till December 2013 which is just 8 months or so. Usually when you get new batteries, they tend to have a date of 4-5 years from date of purchase...
The only unknown is how long it will last, i guess we will have to wait and see.