Instruct: Classify Amazon reviews into positive or negative sentiment
Query: They really don't hold a charge very well

I have a lot of different NiMH batteries. Some from major battery companies, others from the off brands. Some are five years old. These are maybe six months old. These loose their charge (resting discharge) faster than any of the other batteries that I have. They are almost unusable because of this. If I take them from the charger they are good for a couple of hours of use in my Powershot camera. If I wait two weeks, the camera says change batteries immediately. I have done the discharge/recharge cycle, but it hasn't helped.As an alternative, I have recently gotten several of the ready to use (R2U) slow discharge NiMH. These seem to be much better than all of the rest of my NiMH batteries.