Originally Posted by ncyue

I purchased a used Cycleops 300PT on ebay with local pickup partly based on this thread but the owner did not know about the Power capabilities. Indeed, there were no batteries in the hub cap at all. Since this is a wired console I had to specially order the E90 batteries. Can you tell me how to get the batteries seated in the Powertap hub cap? And the positive/negative orientation? I have taken off sequentially both of the hub covers (non drive side) but cannot figure it out. There is no real slot for the batteries and the batteries just roll around in there and stick to the magnet. I am presuming that the magnet is for the cadence and speed calculations, and they display accurately on the console (but do not need the batteries in the hub to do so) . The space is tight but if someone could post pictures to help me (or a video) I would GREATLY appreciate it!