Jantystick LiPo mod

[cnhome1]

Hello,

Just wanted to share my experience with my JantyStick and a basic battery mod I performed. After receiving my Stick, I was well excited to have a go on it after a less than satisfactory time spent with a 901 style device (dont ask). For the first week all was fantastic with billowing clouds of vapour and great battery life. However after a week the vapour from my original atty started to drop off, no problem, I bought 5 more just to be safe. After a week though the same thing in turn, happened with all the other atomizers. I decided to test my atomizers with a voltmeter to confirm the resistance as I had read that as they are dieing the resistance creeps up. I discovered that the resistance on all of them was between 3.5 and 4 ohms which I believe is correct for a 801 style atomizer. So I concluded the only thing that could be wrong is either my batteries are buggered or the atty is dirty/clogged causing the heat generated not to be applied to the liquid causing reduced vapour. After confirming my batteries were holding charge a thought occurred to me, the battery specs show they are 360 mah liion with a max discharge rate of 2C . With my rudimentary electronics knowledge it occurred to me that the potential current draw at 3.6V across a 3.6 ohm resistor is 1 Amp. The max my battery was going to shove out was .72 Amps . Hmm 2.6 Watts compared to 3.6 Watts if my battery was up to the Job (maybe the extra heat will keep my atty clean by burning off the accumulated crap during use). I decided to Shoehorn in a single Cell Lipo with a 750 mah capacity and a discharge rate of 20C (more than enough for running my atty at capacity). The added bonus of using a single cell Lipo at 3.6V rather than 2 cells with a regulator (5v) was the Jantystick built in usb charger can still charge the Lipo, (more than 1 cell would require balancing)

Okay, enough flapping, the difference is outstanding. i am now on a months use on a single atomizer which still performs good as new(definatly was clogging due to lower heat from stock battery). The battery life is great. Ive used a cell with the same dimensions as my stick and have made a probe / adapter that allows me to attach the new lipo without opening the stick. Usb charger still works as the charge scheme for lipo is the same as Lion.

So the point of all the above begs a simple question, why on earth design a PV device around a battery technology which will never be up to the job ?

Regards
Chris

[Jason365]

They simply create propitary or hard to find pieces and parts. To take your money.
Build a nicostick, bask in its glory and your perceived ingenuity.

Jason

[Kelemvor]

well, where did you get the lipo from ?

[cnhome1]

Hi,

Its a Lipo from the blade cx2 contr rotating helicopter Sussex Helicopters Ltd Blade CX2 . I used this for 2 reasons,

1) its dimensions are almost idendical to that of the janty stick so securing it on the outside is quite neat
2) I had one

One thing to point out if you look at the above link is that the battery is a 2 cell lipo but has a balancing connector which you can use to tap off one of the cells. If I stick with the mod I will probably split the pack but I am sure the cells have anno tabs which are a pain in the rump to solder.

Regards
Chris

[Richie G]

Originally Posted by Kelemvor

well, where did you get the lipo from ?

Yep. We're gonna need a model # too. =)

Lately, I'm tasting only what I can describe as not quite cooked e-liquid soon after I plug a fresh battery into the JS. The batts are a few months old and I figured I would change them out with stock ones. Your method seems like it would give a more consistent voltage and subsequently a more even amperage at the atty, hit after hit.

Details, my friend. We need details! LOL

Thanks. =)

[cnhome1]

Hi,

I did copy and paste a link to the battery in my last post ( the bit that read Sussex Helicopters Ltd Blade CX2).

Ahh , i see now, forum rules (You are only allowed to post URLs to other sites after you have made 15 posts or more.)

Just google a EFLB0990

Regards
Chris

[cnhome1]

Just to mention, its interesting that you said "I'm tasting only what I can describe as not quite cooked e-liquid" I had the same impression before I did the mod also. I would describe it as the taste I imagine you would get if you heated a pan full of liquid to just before boling point and then used a straw to inhale the fumes.... flavour but no cigar .

Regards
Chris

[Richie G]

Originally Posted by cnhome1

...I decided to Shoehorn in a single Cell Lipo with a 750 mah capacity and a discharge rate of 20C (more than enough for running my atty at capacity). The added bonus of using a single cell Lipo at 3.6V rather than 2 cells with a regulator (5v) was the Jantystick built in usb charger can still charge the Lipo, (more than 1 cell would require balancing)...

Chris, I'm not understanding something here. You state that you "decided to shoehorn a single cell Lipo" which implies that you physically fit the batt inside the JS where the normal AAA sized batt goes.

Here's a link/pic of the model number battery you provided:

http://www.superiorhobbies.com/istar...R-106197_d.jpg

I understand that pack is (2) 3.7s. But, am I to understand that the AAA sized batteries can be removed from that rather large looking battery pack?

Thanks.

[cnhome1]

Hi,

fair comment, by shoehorn I meant find a way of connecting the battery without opening/breaking the janty. You are correct, it doesn't fit inside, but, it does fit very nicely to the topside of the stick as its dimensions are the same (you can half the hieght if you split the cells). The act of shoehorn consisted of making a battery compartment lid/screw which has an extended probe which connects to the internal battery pole of the janty.

FYI, i see through the noisy cameo thread that janty are making a dual AAA (in parallel) lion device which should be able to deliver as much current as the 801 atomizer requires. The argument they make for using two batteries is "it will last longer between charges" but I suspect its more likely they also concluded the single cell (AAA size lion) devices such as the janty stick don't have enough oomf at 3.7V with an impedance of 3.6 ohms to heat the atomizer sufficiently and are therfore flawed by design.

Regards
Chris

[caesar]

Li-PO (not Li-Fe-Po) is the way to go. More capacity, lower internal resistance, higher current output.

Sadly they come only in rectangular shapes so retrofitting already existing devices doesn't look too nice.