Out of curiosity, how long are your Tenergy 3.0v batteries lasting? Seemed like when I first got them they lasted pretty long. However, now that I've been using them for a while, they seem to taper off more quickly. Is anyone else noticing this? I got the original with the Xhaler as well as some additional ones from batteryjunction and I see this occurring in both... Does anyone know how long they are supposed to last by chance?