Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best NiMH Rechargeable Batteries Yet

I purchased these batteries to be used with a digital SLR and flash. In the past every time I charged the NiMH batteries and left them for more than a week, they would discharge on their own....usually when I needed them most. With these Eneloop batteries, you can now charge the batteries, place them in the device even if you aren't planning on using it for a week or two. Great improvement to NiMH batteries.