Instruct: Classify Amazon reviews into positive or negative sentiment
Query: battery back for 680 not at same quality as the original

This is a package deal with a larger battery and a new plastic back to accommodate the larger battery. The battery is of good quality and will hold a charge much longer than the thin battery used in the 680. In fact it is the same battery used in the 650 so if you moved up to the 680 from the 650 just use the 650 battery. The new back is a slightly different matter. It is of much thinner plastic. Just slightly heaver than the plastic show through packaging used for many electronic equipment. It is not a smooth a fit and tends to fall off. It is hard to lock into place and even if you take extra time and attention in locking it on the phone it still tends of jar loose and fall off in the holster or your pocket. On long trips especially when I am using the radio or pod cast feature and the 680 battery dies I just take the back off and put the larger 650 battery in and I do not even bother with the flimsy easily jarred loose from back.