My suggestion is to get some AW IMR's. They are regarded as some of the best (if not the best) batteries that you can get and they will work in any mod you put them in. If down the road you decide to get a mod such as the provari which only takes button top batteries you will be covered. While I do like the Panasonic batteries and I do own a few, they don't work in all my mods. Everyone with a big battery mod should have at least a couple of AW's in their collection.