They make fake 3000mah and 4000mah batteries that are really something like 1000mah. But if you know you're getting lower capacity batteries than advertised, they're not bad.... at least, I haven't had any issues with them, but I'm only on my third set. However, you may be right about them not being good for the Vamo, because I use them in a Vape-Pro, but as far as I know both devices have the exact same features in regards to power regulation. BTW, these have been lasting me about 1-2 days before a recharge is necessary... the 2200mah batteries last about 3-4 days. So, if you're willing to make the compromise, it's not like they're going to fail on you within a few hours like those little 510 disposable auto batteries do. However, DO go with better quality batteries if you can. The only reason I'm even running them is because I just want to find out if they at least work decently as 1000mah batteries.
If they work I wouldn't go buy more but I don't know I saw someone on facebook complaining that their batteries sucked