Review on Long-Lasting Power: Ultralast UL129VB 9V Alkaline Battery, 12 Pack by Jerry Mackey

These batteries were definitely worth their price. However, the connecting posts seem to be a bit off. The socket felt too tight and was difficult to fit over the adapter pin. However, the pin of the plug was too small and it came out of the socket on the adapter. I had to squeeze the adapter socket with pliers and even then the connection wasn't very tight. I believe the batteries are slightly different from the standard batteries. I don't know what the durability will be as I just received the battery.