D V.

I had a RC-15 that stopped working. I contacted the warranty department at Fenix and to make the story shorter I was sent an RC-20 as a replacement for the RC15. I wish I had gotten a RC-20 because I had several chargers for that model, but apparently no RC20's were available, for what ever reason. The first RC-20 was DOA. Back and forth with the warranty, trying to establish if it was the light or the battery. To me this is non-sense. Things breaking down is a fact of life, DOA is lack of quality control. Second one is sent in, I forgot what the problem was, but it didn't work either ( this has been about a year or so ago). I don't feel that I should have to keep a detailed log with every event for something as mundane as a flashlight. Third one is sent, a return label was issued, previous 2 lights are sent back to manufacturer. Well, I thought 3rd time is a charm. Not by any means. The problems I see with the RC-20 is that it didn't fit the old chargers, I'm not sure so much changing is actually better, not in my case. The location of the switch on the end cap, is not my favorite location because I'm old and the thumbs hurt to activate or change to light settings. Having 2 switches on the back cap, may work in theory, but in reality it is hard to do it. Light intensity keeps getting changed unintentionaly, I have big hands and almost impossible to reliably work the 2 switches as intended. Good idea, horrible execution There is on good point, one can check battery level with display LED, between charging poles.
And now for the final act, this freaking light has an intermittent problem, sometimes it turns on, or not turn on, then it doesn't turn off, or goes into strobe mode, all this at random. As far as use for as a tactical light it is a big zero. If you need to have something that must daze someone, or permit you to be concealed, forget this thing.
The last thing that you need is to have something that goes into flashing mode, when you don't want others to know where you are. I don't know if this is bad luck, poor design, execution of the project, or just cutting corners to be more profitable. Warranty department handling of the claim wasn't as smooth as I had from other light companies. Turn around however wasn't so bad.
I"m now back to contact the repair/warranty department and see what happens.
Definitely not a model that I would recommend, on the other hand the RC-15 worked very hard for a few years.