I found some 9900 mAh batteries (18650) but they appear to be fake. The man in this video uses a skyrc imax b6ac v2 Professional battery charger/discharger. He found the 9900 mAh batteries are completely fake. Watch his video here. https://www.youtube.com/watch?v=hWmy-MWRZZc Not only are they not 9900 mAh, they’re not even 1000 mAh…
The 9800 are also fake. See this video about the 9800 mAh. https://www.youtube.com/watch?v=gGF9DZcBric
The 5800 mAh 18650’s are also fake. See this video test. https://www.youtube.com/watch?v=9-tWXHkbuKk
The 10000 mAh are fake too… 
https://www.youtube.com/watch?v=8FspG0aVCcI
It seems the best batteries are by Panasonic and Samsung. The highest rated by these companies I’ve found is about 3400 mAh and they are real.
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Anything over 3500 mAh is fake. Samsung 35Es are the go to 18650.
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One good way to go is find a vape shop. They will know exactly what you need.
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From the little research I’ve done so far, the main difference is the voltage these batteries are capable of outputting. Some manufacturers will warn against use in flashlights as the battery is lacking PCB protection or will outright fail if the battery gets undercharged or might overheat if overcharged. I’d personally avoid obscure brands without getting professional opinion - i.e. get recommendation from vape shop. Otherwise it depends on what’s available in your region. In my case Sony VTC6 30A 3000 seems like the most popular option and personally what I would go for, but I could be terribly wrong. Ultimately it comes down to power requirements of uconsole itself. I’ll worry about that once my order finally ships though.
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Nahhh, that’s wrong. They all output 3.7 volts. It’s the amps that we are discussing here. More accurately the Amp-Hours. Amp-Hours determine how long the batteries can keep a device powered on. What we have found is that many battery manufacturers are out right lying and claiming huge capacities. Then when they are tested their capacity is far far lower. Example: the 9900 mAh battery that is only 500 mAh. The manufacturers are just outright lying. Don’t worry you will get your device soon. 
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This may be old news to many of you but a friend of mine recently gave me a bunch of old laptops to recycle and I (VERY CAREFULLY) dissected the batteries and they were just chock full of 18650s, most of them with 2000+ mAh. If you want a source of a bunch of them for basically zero cost, could be worth a look, especially if you have a laptop that is broken for some reason that isn’t related to the battery.
I followed this video
I also bought one of these thingies:
And with that I took the best of the salvaged 18650s, stuck them in my uConsole, and then I keep the extras charged and available as backups in the powerbank. The trick is finding a way to store 20+ 18650s without them accidentally shorting out by touching each other the wrong way.
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I have done that for so many projects that require batteries.
I am currently using those from nitecore, and they provide 5-6 hours of work.
NL1840 Their length is over 69mm (69.8) but they actually are fitted well.
Max capacity is 3500mah
Also if they feel light is indicator there fake
It’s okay those there small chance they got 3500 wrapped them with 4000mah you are allways able to check tho