Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Won't charge batteries -- that's not good.

This charger won't charge my batteries. It is the right model for the batteries I have, but when it tells me that it's all done charging, the camera only gets a few seconds to a few minutes of life out of them. My Canon charger charges the exact same batteries just fine, so it's not the batteries I'm using. Useless.