Instruct: Classify an Amazon review into positive or negative sentiment.
Query: OK addition

OK addition to my stack of batteries and regchageable batteries. Universal: even does 9Volts and button cells. Not a piece of fine art either. Most important: lets you to separate junk rechargeable, that just DO NOT hold the charge from all right ones (thanks to this device alone I saved ~$50 by returning 10 packs of Duracell latest 2600mA, which hold the charge substantially worse than ANYTHING else)