Whether you absolutely need the colored (Glitter) was any left itself - I personally find it convenient because it is no longer safe in the pure white of a certain number in the camera bag which are full and which have to be loaded.
For my flash I 4er sets one color - because I always know what I've been shot yet.
This is also the only circumstance which I would rate as a negative - you can only buy 8-sets with all the colors, that I had to get 4-sets of the same color to buy 4 8-sets!
Here it would be nice if you could put together these sets individuel itself.
For the batteries per se but there is an absolute buy recommendation - I will not use for the time being other more.