Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Works, but overstated capacity

My friend gave me her old iPod 5.5G 40GB, but its battery would barely last a half hour. I bought this battery because it was said to have 550 mAh, an improvement over the stock battery.The installation was not too hard, but if the case opening tools were a bit sturdier it would have been easier. I had a bit of a tough time because the tools broke a bit while using them, and made it hard to continue working with them, but after I had opened the case the rest was straightforward and easy.My main complaint is that I don't think that the battery is really 550mAh. I use RockBox, configured for this battery's larger capacity, and the battery life indicator does not accurately represent the actual amount of battery remaining, it always overstates it. If the battery really performed like it was stated, it'd get a 5/5 rating. But this is good enough, I still get a great amount of time out of this battery until it runs dry, even if it's probably not really 550 mAh worth.