I hope they will understand the problem…
The question perhaps is do they care?
I opened a dispute (Aliexpress) and their technical drawing (left) is wrong.
It’s a shop with only optics.
They have numerous lenses and TIRs.
The package smelled of PMMA 
I just hope they change the product page or get those actual lenses, which seemed to me to be nice primary optics (to get all of the light emitted onto the secondary lens)
We’ll see.
It’s not about the money, although i requested a refund.
Dang… I always want stuff that either doesn’t exist or is otherwise unobtainable…
Like a decent parabolic mirror for example, to make a recoil light, or aspheric meniscus lenses like above…
Or good / affordable 25500 (C cell) Li-ion batteries.
O well…
Wild guess. These parts, including the 25500 cell is for your POPlite mod?
Ah, yes, my disappointing POP lite….
I think i shouldn’t have bought it…
Never seen such an ugly beam / spill in my life… :person_facepalming:
We’ll see…
But indeed, i was looking for 25500 for that and another light.
The POPlite turned out to be a POOPlite… Shame… You can get 25500 from akkuteile.de for a bit less than 10 Euro. Shipping is like 12.50 Euro I believe…