Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor capacity

I have a complete set of Bosch 18v tools that have seen very little use due to poor battery performance. The original set (non BlueCore) lasted for only a few cycles before failing. One melted the plug end, the other quit taking a charge. I replaced them with a pair of the newer BlueCore. These did slightly better with good capacity but again had very short lifespan, providing perhaps half dozen cycles. I was about to dump the whole tool system but decided to try one more set of batteries. This latest pair from Amazon have very limited capacity, far less than my old 9.6v Makita, but are working and hopefully after a few cycles the capacity will improve.