I have two batteries, one auto and one manual. The manual seems to perform well, the auto did good at the beginning (about 3 weeks now) but lately I seem to be sucking allot of air. I still am not sure what the problem is, at first I thought it was the cato, because it only seem to happen with a couple of them, now it seems to be the case with almost every one I try.(not all of them) Seems to be mostly ones that I have refilled (not always though) Seems to work better right after a full charge too? If I am sucking allot of air from that one and switch that carto over to the manual battery it performs much better. Is there anything I am doing wrong? Do I have a bad battery? Any thoughts would be appreciated. 
