During my battery gathering I've ended up with 16 Nimh D cells. 6 tenergy 10k mah, 4 powerex 11k mah, and 6 titanium 12k mah. This happens when other buy you batteries. Not complaining. If they get mixed in the same flashlight will all be ok?
Unlike other statements that you see everywhere these days, the "Do not mix and match cells of different brands or capacitites" one is very true. It's never a good idea to do so. Eventually, you will always run into trouble, sooner or later.
It's not advised to mix and match as others have stated. But for low drain applications it shouldn't be a problem as long as you monitor the voltage of the cells.