The HG2 is an excellent battery. I have a dozen of them and keep them paired and in rotation on my series box mods. I also use a lot of the Samsung 25r's too. You can't go wrong with either. Just beware of where you buy batteries from. I usually buy from Illumn.com, Orbtronics, RTD, but there are other good ones. I've dealt with MVS in the past for several things. I just haven't bought batteries from them before.