Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Fail to charge to specified capacity

I have about 12 of these batteries, both 2200 and 2700 mAH types. They seemed to work well initially but then quickly began to fail. Two issues cropped up. First, all of the batteries fail to charge (or discharge) anywhere near the rated mAH. I can't get more then 1000 mAH out of any of them any more, even after massaging them with a fancy charger, and they are still virtually brand new (maybe 15 charge cycles on them max). The second issue is that about half of them start reading 0V after sitting on the shelf for a weeek and it takes applying a voltage for a short while to get the battery to read > 1.2V again. Clearly there is something seriously wrong with CTA's manufacturing process. Do not get these batteries.-Matt