I have a 5v boxmod that the guy who gave it to me told me to buy trustfire 14500 900mAh 3.7v Li-ion batteries for it, which I did and am loving it at 5v. I have a chance to also get some trustfire 14500 900mAh 3.6v Li-ion batteries as back ups for fairly cheap. I do use the trustfire multifunctional charger. My question is shouldn't the 3.6's be o.k. to use in this? Sorry I am a bit paranoid after someone spoke to me about an e-cig battery accident recently. Thanks y'all keep up the good work.