Everyone vapes at different rates so it's hard to judge. I think I'm a heavy vaper and for me, a 1300mAH battery lasts me more than a day, but I go thru more than one 650 mAH batteries. So I think you're guess is probably good - somewhere between 1000mAH and 1300mAH.I'm not sure, I guess just stepping up to the 1000 MAH range. I just want to stop constantly shuffling bats on and off a charger.
+ 1 on this.. . .Any standard 808/901 equipment will work on either the Echo or vGo models. The difference between the two is mainly aesthetics. In my opinion, standard 808 cartos and clearos look better on a vGo with a cone but they will perform just as well on an Echo.
-- The Echo battery has a wider diameter than a standard 808 battery. If you put a standard 808 size carto on it, the diameter jump between the battery and carto makes it look like two things glued together (IMO, anyway). The Echo-specific cartos are tapered, with the mouth-end having the same diameter as a standard carto, and the battery end matching the diameter of the battery. So an Echo battery with an Echo carto looks great. I believe this also applies to the the V4L OMG. The Echo is also an automatic battery, so if you want automatic, this might be the best choice.
-- The IGO/vGo variant batteries are also a larger diameter, but they have a second set of threads below the carto threads. These are for attaching a 'cone' which tapers from the battery diameter down to a diameter slightly larger than a standard carto. The cone is basically a 'cosmetic' and makes the battery-cone-carto look like one piece. So if you want to use your existing 'standard' cartos and have the convenience of a big battery and want it to look good, this is might be a good option for you. I believe these are all manual batteries. FYI, this is the route that I went because I like the combination of carto and e-liquid that I use and the echo-type cartos just didn't do it for me. Also, I tend to kill automatic batteries because I don't fill cartos carefully enough
-- BTW, you might find that the cones are listed with EGO batteries on vendors' web sites. The one's I bought were a little too narrow at the carto end and I had to widen them just a little bit.
-- BTW #2: If you're uncertain about compatibility, just contact the vendor and ask
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