You can use the LR on the lower mAh Batts, it stresses them a little bit but as long as you don't chain vape them they will work and the batts will last, yes they wont last as long of course but I have been using a 901 Mini Batt with a 510 Adapter on it with the LR Boge as well as a 1.5 LR 901 Atty's and been using these Batts for 6 months now, no issues, I have 5 in rotation and they are 180 mAh maybe even less considering they are shorties but either way they vape great and for something like $6 a Batt if I get 6-12 months out of them I couldn't give a dam. They are a nice set up for those times when you want to use a small set up like a regular cigarette and they feel and look nice as well as put out nice plumes of vapor with great taste, My little PC hold 5 Batts and comes in very handy when in certain places where a big unit would look and be possibly frowned upon.