http://www.tmart.com/FandyFire-USB-Micro-Rechargeable-18650-Lithium-ion-Battery-3400mAh_p348538.html
Really?? Isn't this just a little too much? Or a little too scary?
Guess I'm getting old, but this is really just about the last thing I would want to see done to a Li-ion cell. In cell charging!
Of course, Ultrafire has them too! Same cell, just the name change.
Things Come And Go. 
Ah yes sorry the water in the river is very low and I can finally do work I want/need to do since we live here
So I am so beat at night after lifting sharp heavy rocks
(From the water to make a nice play/leisure private beach without sharp rocks everywhere. Though 40°C in the sun the cooler river waater makes it doable to work 
)
I bought two ore production Brinyte cells like these for testing and they work rather nice
I’ll write a short review asap because they are pretty nifty cells. Charging works fine
YIKES! 
Might be viable if the charger and cell quality were good (which these brands probably aren’t). Just because an idea can be turned into an item doesn’t make either one smart.I’d still want a full-size cell for a little more capacity; needing a separate charger isn’t really much hassle and is far more versatile.
Phil
HKJ thought the Mecarmy one was alright. Looks identical to the *fire ones.
The Brinyte cells fit my chargers with no problem
They have the same capacity as the Panasonic protected cells I have 12 of (it is the same cell under the wrapper)
I am waiting for some answers from Brinyte because I got pre production cells and did an experiment with them that turned out really good but their engineers were saying NO DON’T DO IT when i emailed the idea and lol during the course of it emails flew back and forth the whole time , they were as anxious as me how it would go
Tell all about it in the review.