Instruct: Classify Amazon reviews into positive or negative sentiment
Query: One ugly, impractical battery

It may have twice the capacity of the standard battery but it's also twice as thick and twice as heavy.Pros:1. Longer time between charges than the standard unitCons:1. Too fat, so any existing cases you may have your phone are not going to fit properly2. The replacement cover is needed due to its size; this is a cheap bit of plastic that doesn't fit my phone properly, leaving a small gap3. Converts the phone into a relatively small unit into a chunky monster that's noticably heavier in the pocketOverall, don't bother.