Morning all! Thanks for all the comments. Just a quick update before I collapse into my pit after the 13th birthday party!
The tins will be changed so they are more like a standard Altoids tin, but i'll need to order them in bulk - which will have to be after payday unfortunately, as the soft drinks bar bill for my daughter's party put me in the hole by £300!
The battery holders are a bit of a nightmare, to be honest, because most 18650's are anything but those dimensions - so I heat the holders are stretch them slightly using an oversized 18650 form. I use the blue Senybor batteries which have BEAUTIFUL nipples, but they are snug - but every 18650 tin I make should be sent out with a small magnetic spacer - apologies to OS and KMS that I overlooked them on the prototypes.
The final thing is - I will be making a PoTV mini tin which takes a 14500. Done the tins, need to do the "innards"!
Hopefully will have something to offer up in the next few weeks.
All the very best,
Lee