Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not suitable for Canon EOS 50D

I bought this battery as a backup for my Canon EOS 50 D. Do not buy this battery! It barely fits into the space designed for the battery and taking it our again becomes a major operation as the built in spring mechanism is not strong enough to push the battery up again. I doubt that is is an original Canon battery. Unfortunately I discovered this only after the return deadline had expired.