Whilst used as a spare battery, it performed as well as the battery supplied with the Panasonic Lumix FS-35, and was around the £20 mark as opposed to £40 for a replacement battery (though even cheaper alternative batteries can be obtained) . However, this particular item has expanded slightly since recharging and therefore, no longer fits properly in my camera. Hence no longer used as I wish to prevent damaging my camera by pushing it in. I do not know if this is a fault simply of the individual item I bought, or a more general occurance. Hence, a middle of the road assessment. Had my own battery not expanded, I would have given a higher rating.