Okay, batteries not dear, but that does not last at all. Mod used in a e-cigarette (V5 Vamo) they last only half the time of batteries 900 mAh (unmarked) that were shipped with. In addition, they are marked "Protected", so it should be protected against short circuit, nay! Ultra-Fire would be the most counterfeit batteries in the world. Spend votrze way and buy brand batteries! Really disappointed.