She has 5 or 6 now, I gave all of mine to her. The oldest ones are from December, newest from February or so. I told her to clean the ends routinely though IF she is doing this I really can't say for sure. She says she is, upon inspection they don't appear dirty/gunked up. Probably going to say no on the deep-cycling. I'd say all batteries go though at least 1 charge cycle per day perhaps maybe 2. She vapes pretty heavily.
Wow. They didn't last very long, did they? I have V4L batteries that are over a year old and still going strong -- of course, because I have so dang many, it's really hard to say how many times a given batt has been cycled!