I usually use my Vamo with stacked 18350's from efest. I Just bought a Panasonic CGR18650CH to try on single mode. I noticed that on low resistance carto's (reading 1.7ohms) it works just fine. But when I pop in a higher resistamce atty (reading @ 2.7ohms) Vapor production really diminshes. The atty barely gets warm at 8.0 watts. I need to set it at atleast 14.0 watts to get any meaningful vapor. Even at 14.0 watts the atty doesn't get hot, just a little warm. I would say it feels more like 6.0 watts. Are Vamo's known to have a problem stepping up the currents? Any thoughts?
- Status
Mine works fine with either battery and I use 1.5 ohm dual coil cartos at 11.5 - 12 watts. But I do notice a little better performance with using the two 18350's. My batteries are all Efests, however. I have read other posts where people have had problems with the Panasonic 18650's. Is the Panasonic protected? You don't want to use protected batteries in the Vamo. I have now started using a spacer with the 18650 in order to make a better connection which is not necessary with the two 18350's.
Interesting....
Using the same bats here, but I don't have any high res atty's.
Are your batteries charged fully? (output starts dropping around 3.6V)
I got my batteries button top from vapoligy and there is still plenty of room in the tube, so I doubt they are protected.
Panasonic CGR18650CH
I will try the 2.7ohm atty with a single imr efest 18350 and post later. I'm wondering whether the folks that are happy with these CGR's are using lower resistance deliveries.
I just wanted to add, that i really like the Vamo. I have been using it with stacked batts since February and wouldn't give it up for anything. The convenience of switching to volts/watts and having dedicated power +/- buttons is awesome. I actually bought the CGR's to use when the 18350's are out of charge-- avoiding the mad dash and charger fumble. But I'm still wondering about the single battery oper.
The link you provided for your batteries shows a battery that looks wrong.
I couldn't get the zoom on the page to work to get a better look.
It looked like the battery was marked IMR which is factually incorrect for a CGR18650CH.
They may be some sort of rewrap.
Here's a link to some that I know are genuine:
$10.03 Panasonic CGR18650CH Rechargeable 2250mAh 3.7V 18650 Lithium Batteries 2-pack - authentic cells / 2-pack at FastTech - Worldwide Free Shipping
If your Vamo behaves normally with a single efest then you will know those bats are your problem.
They may very well be re-badged 18650s, but not necessarily the wrong batteries. His batts are button tops, your grey batt are "flat tops" Here's Obtronic's version (re-badged).
Yeah, anyway my internet is pretty bad...
I got the image zoom to come up and it looks a lot like it may be the Keeppower rewrap which should be a pretty good battery.
Test of Keeppower IMR18650 2250mA (Black)
I got the image zoom to come up and it looks a lot like it may be the Keeppower rewrap which should be a pretty good battery.
Test of Keeppower IMR18650 2250mA (Black)
In your case, when switching from a 1.7 to a 2.7 ohm atty, current doesn't go up, it's goes down.
There are a couple of things going on here. One way to look at this is that by going from a 1.7 ohm atty to a 2.7 ohm atty, you essentially changed the resistive load by over 50%... (50% of 1.7 ohms = .85 ohms). So, by going to a 2.7 ohm atty, you changed the load by 1 ohm. This in itself was enough to cut the current in the atty substantially and given that you had the Vamo set at 8 watts, as the current went down, so did the warmth and vapor production.
To realize the same warmth and vapor production the coil inside the 2.7 atty would need to be heated to roughly the same temp as the 1.7 ohm atty. To get the same temp, you would need to raise the voltage to about 5.9v (about the full capability of the vamo), which would give you a higher current. All in all, it calculates to about 12.8 watts.
Basically, setting the Vamo to 8 watts limited the warmth and vapor produced when you changed to the higher ohm atty.
There are limitations to VW mode that a lot of people don't realize.
With any mod that can take either two 18350s or a single 650 whenever you use the 650 you won't get much beyond 10-12 watts. You need the 2 350s for full power.
The bolded text is what you might be missing.At 8 watts this shouldn't be as issue or am I missing something.....
Hey piggy, have you tried a single efest @ 8W yet and compared with the output of your panny?
At 8W you should get some decent performance with lower ohms but with standard or higher you will be limited to what the circuit can boost and put out. It is much easier to limit 8.4 volts than to boost 4.2. My earlier estimate of 10-12 could realistically be lower than that. So if you plan to run high ohms either use 2 350s or don't be surprised with less performance for longer battery life of the 650
I don't have the link to it but I seem to remember pbusardo's vamo review mentioning a limit of around 11 watts using the 18650 bat where he didn't get max power out of it and had to stack 18350's to use 11-15 watts. It's been awhile since I saw it so hopefully I am remembering and saying it correctly.
- Status
