Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Leaked, damaging my stuff

Pros: If nothing goes wrong, NIMH type batteries are known for being an excellent rechargeable, capable of going for hundreds of charges.Cons: I bought lots of these, and many leaked, partially breaking all three of my photography external flashes, which are $220 each. :( (I had to sell the flashes for a lot less than they were worth.)