Anyone have any experience with these 3,600 mAh TangsFire 18650 batteries? I've never heard of the company before and I wonder how honest the 3,600 mAh rating is. The specs seem too good to be true: 3,600 mAh and rechargeable up to 1,800 times. I don't think I've seen a protected battery with those claims. I'm doubtful, but would love to be wrong about these.