Actually, AW and Eagletac are producing protected 18650 with capacities of 3400mAh, unprotected ones IIRC goes up to 3600mAh if i'm not mistaken.

by the way, where is your location, would be interested in passing you my power bank for testing or either could you lend me your resistors and the USB connector for testing?

I have the Yoobao YB-655 rated at 15600mAh and also an EXC with li-po batteries rated at 12000mAh. Would be interesting to test these 2 power banks as they are relatively new in the market as well.

Ultrafire products are crap FYI. I've been playing with flashlights and Ultrafire are crap in the flashlight industry. Their batteries are also way overrated in terms of capacity. That 3800mAh capacity is definitely fake. And its highly unlikely they will use Ultrafire batteries in a power bank as it's most likely a protected cell as well. Nobody uses a protected cell in a multi-cell device with it's own circuitry.

protection circuit also protects from overcharging(above 4.3v straight cutoff) and also overdischarging(cutoff below 2.7v). If protected cells are used in a high drain device(like in an e-cigg), the voltage may drop to below 2.7v due to the high current draw and activate the protection circuit which is why you don't see people using protected cells in high drain devices like e-ciggs and high-powered incandescent flashlights.

They rather add more cells than to purchase the 3400mAh cells. For example the YB-655 rated at 15600mAh means each cell is 2600mAh, but if you use 5x3400mAh you can achieve a higher capacity plus a smaller power bank but it's just not economical for them I guess.

Or either could you pass me a few pieces of your resistor and maybe your DMM so I could test it myself and post the results here as well? Your DMM comes with logging features?

And if you're talking about people who use unprotected cells, for eciggs once the battery reach a certain voltage the flavour and smoke amount will be different so that's a sign that the capacity is running low. Similar for a flashlight, once the battery reaches a certain voltage the light output will lower down showing the battery's almost up. Usually when this happens the battery should still be above 3.0v but unless the user is completely ignorant then yes he can run the battery down way past 2.7v and maybe even down to zero. By then the battery had been permanently damaged and had to be disposed of. That's why users who handle unprotected li-ion cells should be educated on it's characteristics and charging/discharging methods.

i also opened my original Yoobao before, found 4x 2500mAh cells instead

weird thing is it's confirmed an original.

nope it was an ori. confirmed original from the SN and also matches all 'original' markings found online

Hi guys, sorry for bumping old thread, but thought this would be interesting.

Got a few fake powerbanks and i tore them apart for comparison and a quick talk about the cells etc.