Hey RichH!
So, about the comparison on the Cree vs Nichia versions, I did a comparison here: “REVIEW”: RovyVon Aurora A8 UV – 350 Lumens – Nichia 219C – Keychain Light - #14 by MascaratumB
One is the A5R and the other is the A8U.
If you ask me the major differences and advantages, I’ll tell you what I think:
-If you need a brighter light and for a longer range illumination, choose the Cree.
-If you will need it for closer works/needs, and need better colour rendering and less tint shift, go for Nichia.
-The RED side light on the A5R is dimmer than the A8U
-The WHITE side light on A8U is more pleasant than the one in the A5R.
About charging I can tell you that in about 8 months using them, I only charged them twice, but I don’t use them constantly. I carry the A5R in my home’s keychain and the A8U in my neck. Both are used almost everyday, but for short periods. And because of this I cannot tell you much about runtimes too, as I don’t use them for long periods of time.
They have a new flashlight, the A23 with XP-L and Nichia LED that has a battery with bigger capacity (1000 lumens, 600mAh). Take a look at it here:
https://www.rovyvon.com/products/a23?variant=29510580273255
I hope this helps on your choice 