I bought this as a reserve battery along with Mains Battery Charger for Sony DSC-HX100V Cyber-Shot Digital Camera and I've been using it since June.
Both battery and the charger work together very well and it takes less than an hour to fully charge the battery. In my opinion this battery is more than equal to the original battery supplied with the camera. Considering the price (the battery & charger together costs less than 20 £)anyone looking for a spare battery and an external charger should get these products without any reservations.
PS: This review is intended to cover two products