Easy OKR-T VV mod

[skipdashu]

It did well @ 2A, but note most will not want to dag a cell down to 2.8V, even the 3V cut-off I mentioned (which now puts them <600mAh) may be a tad to low.

Found this comment interesting:



The China made Tenergy 14500s are rated at 800mAh.

I'd like to see someone add a protection circuit to a Sanyo 14500 as they list capacity at 840mAh.

With their 18650s both Tenergy and Sanyo's mAh ratings are quite accurate and top performers.

Do you have a retail link for either of these 14500s?

Have you looked at these: Panasonic CGR18650CH 2250mA. I'm using these in my LavaTube with good results but they are unprotected. They seem to be some slightly safer version of Li-Ion but not IMR/LMR. I don't know what the chemistry is. Somebody in a flash light forum ran them up against some AW IMR 18650s and they compared well.

Haven't seen any other size of the Panasonic.

Wow, just found this at Callie's Kustoms: Guess it is an IMR.
2250 IMR 1mm Top
These are the new standard in which to judge all other IMR's! What are the advantages of IMR vs standard lithium ion batteries?
Longer Life over typical Lithium Ion batteries
Higher output. Up to 10 amps continuous discharge
IMR is considered a safer technology, less chance of explosions

 

[Domtine]

I think D1 is backwards. Still looking at SW3.

ADD:
I am a bit uneasy about putting a switch on the high amp load line and don't see the purpose. If it's for meter switch take a look at THIS which uses a SPDT with center off that was sourced earlier in this or maybe the Dena vv thread. I've got an invoice around here someplace for it... online components, or mouser or all electronics.

For D1 i took ref fr this Zener diode - Wikipedia, the free encyclopedia

SW3 is for adjusting the voltage without firing the atty. SW4 is for on/off the volt display.

 

[erich]

I went back and re-flowed where all 5 pins connect into the mini-board. Now trying to figure out how high I can go on R2 before the thing just stays on. 13K and 12K didn't work. I put 2 12Ks in parallel and that worked. Now I have a huge 2K power resistor in series with the two 12Ks in parallel (8K) and that works. I suspect Mamu was using a 10K for a reason. Time to go look on the Rat Shack as that's all that'll be open around here tomorrow. I'm actually surprised that this thing need this dropping resistor that low. The 5v things I used in the past you could use 100s of K on the enable/disable pin.

I got a better idea... instead of open sourcing the PCB file, create the board and watch me open source my wallet to you ;-)

I'm such a noob with gEDA it's not even funny and I've never created a pcb in my life. I found it in the repositories when I decided I needed to draw a picture that I could share. Does that rather nicely.

So, there are actually a couple of ya'll out there that could load up a .sch file instead of me taking screen shots of it!

Last time I worked in electronics we had big vacuum tubes and had figured out that you could heat a ham sandwich up on the feed horn of the antenna if you cranked it to point straight up in the air ;-) Thank you USAF.

Mostly a HUGE thanx to ya'll for giving me a hand with this.

Skip

PS: Local Rat Shack has 10Ks I have a pair of AW IMR 14500s that I'm running down to see when this thing decides they are too low and will not fire. At 7.25v no load / 6.7v loaded and it is still firing. Next up is to add back the V display and it's switching.

Updated the temp schematic HERE or .sch

10K was the best I could get to work with the 6A... In retrospect, the 3 was probably sufficient.
http://www.e-cigarette-forum.com/forum/modding-forum/191607-easy-okr-t-vv-mod-23.html#post4745373

 

[Java_Az]

Do you have a retail link for either of these 14500s?

Have you looked at these: Panasonic CGR18650CH 2250mA. I'm using these in my LavaTube with good results but they are unprotected. They seem to be some slightly safer version of Li-Ion but not IMR/LMR. I don't know what the chemistry is. Somebody in a flash light forum ran them up against some AW IMR 18650s and they compared well.

Haven't seen any other size of the Panasonic.

Wow, just found this at Callie's Kustoms: Guess it is an IMR.
2250 IMR 1mm Top
These are the new standard in which to judge all other IMR's! What are the advantages of IMR vs standard lithium ion batteries?
Longer Life over typical Lithium Ion batteries
Higher output. Up to 10 amps continuous discharge
IMR is considered a safer technology, less chance of explosions

If you decide on the Panasonic CGR18650CH 2250mA batteries you can save 3 bucks a battery and you get free shipping for this place in FL. They also have the best deal on the li ion 3100mah Panasonic's that i have seen here in the USA.
http://www.orbtronic.com/batteries-chargers/imr-panasonic-cgr18650ch-10a-18650-rechargeable-battery-cell-high-drain

 

[Java_Az]

Do you have a retail link for either of these 14500s?

Have you looked at these: Panasonic CGR18650CH 2250mA. I'm using these in my LavaTube with good results but they are unprotected. They seem to be some slightly safer version of Li-Ion but not IMR/LMR. I don't know what the chemistry is. Somebody in a flash light forum ran them up against some AW IMR 18650s and they compared well.

Haven't seen any other size of the Panasonic.

Wow, just found this at Callie's Kustoms: Guess it is an IMR.
2250 IMR 1mm Top
These are the new standard in which to judge all other IMR's! What are the advantages of IMR vs standard lithium ion batteries?
Longer Life over typical Lithium Ion batteries
Higher output. Up to 10 amps continuous discharge
IMR is considered a safer technology, less chance of explosions

If you decide on the Panasonic CGR18650CH 2250mA batteries you can save 3 bucks a battery and you get free shipping from this place in FL. They also have the best deal on the li ion 3100mah Panasonic's that i have seen here in the USA.
http://www.orbtronic.com/batteries-chargers/imr-panasonic-cgr18650ch-10a-18650-rechargeable-battery-cell-high-drain


Double post please delete MODERATOR ,,,,,,Thanks

 

[meatsneakers]

If you decide on the Panasonic CGR18650CH 2250mA batteries you can save 3 bucks a battery and you get free shipping from this place in FL. They also have the best deal on the li ion 3100mah Panasonic's that i have seen here in the USA.
IMR Panasonic 18650 Li-Mn-Li-ion CGR18650CH High Drain 10A Rechargeable Battery Cell

Are these guys legit? Their 3100 protected Panasonic cells are much cheaper than the AW offerings. Anyone have experience with this company?

 

[Java_Az]

Are these guys legit? Their 3100 protected Panasonic cells are much cheaper than the AW offerings. Anyone have experience with this company?

I just bought a couple of the CGR18650CH cells from them. I haven't got them yet as i just ordered tonight but I did check them out before buying. They have a ebay account with over 3000 feedbacks and 100% positive in the last 12 months. They also sell on amazon and have a 4.9 outa 5 stars rating. So that was good enough for me. I will let make a post when the batts arrive.

 

[meatsneakers]

Thanks Java, looks promising. Those 3100mah Pan cells are $20+ shipping from AW so these work out to be the same price as the 2200mah cells. As long as the quality is on par with AW we might have cheaper option for good cells.

 

[skipdashu]

If you decide on the Panasonic CGR18650CH 2250mA batteries you can save 3 bucks a battery and you get free shipping for this place in FL. They also have the best deal on the li ion 3100mah Panasonic's that i have seen here in the USA.
IMR Panasonic 18650 Li-Mn-Li-ion CGR18650CH High Drain 10A Rechargeable Battery Cell

$2 cheaper but + shipping HERE.

 

[Java_Az]

Thanks Java, looks promising. Those 3100mah Pan cells are $20+ shipping from AW so these work out to be the same price as the 2200mah cells. As long as the quality is on par with AW we might have cheaper option for good cells.

There are quite a few companies using the Panosonic cells Callie's Kustoms has protected 3100 mah and also Redilast is another new company that has them. Out of all of them Redilast uses a top notch Japan made protection circuit. They are the best in my book, but cost just as much as AW's. But really thats the only difference in cells is what protection circuit they slap on them.

$2 cheaper but + shipping HERE.

I saw those, but they are sold out right now so i didn't check into if it is a good company to buy from or not.

 

[skipdashu]

For D1 i took ref fr this Zener diode - Wikipedia, the free encyclopedia

SW3 is for adjusting the voltage without firing the atty. SW4 is for on/off the volt display.

I looked. It's still backwards.

 

[asdaq]

I got two from smartvapes for $18 shipped. All good, fast and no complaints. Discount code ate away on the low shipping.

 

[WillyB]

... Have you looked at these: Panasonic CGR18650CH 2250mA. I'm using these in my LavaTube with good results but they are unprotected. They seem to be some slightly safer version of Li-Ion but not IMR/LMR. I don't know what the chemistry is. Somebody in a flash light forum ran them up against some AW IMR 18650s and they compared well.

Haven't seen any other size of the Panasonic.

Wow, just found this at Callie's Kustoms: Guess it is an IMR.
2250 IMR 1mm Top
These are the new standard in which to judge all other IMR's! What are the advantages of IMR vs standard lithium ion batteries?
Longer Life over typical Lithium Ion batteries
Higher output. Up to 10 amps continuous discharge
IMR is considered a safer technology, less chance of explosions

LOL. Callie is a T-Shirt printer and an idiot. Having seen the word 'manganese' he now decides to proclaim them 'IMR' and then quotes some IMR boiler plate text. These are not LiMn2O4 cells. Panasonic does say the are as safe as them though.

but they are unprotected. They seem to be some slightly safer version of Li-Ion but not IMR/LMR. I don't know what the chemistry is

You had it right the first time. The Panasonic CGR18650CHs are certainly decent high drain cells and are a bargain at about ~$9.

 

[skipdashu]

There are quite a few companies using the Panosonic cells Callie's Kustoms has protected 3100 mah and also Redilast is another new company that has them. Out of all of them Redilast uses a top notch Japan made protection circuit. They are the best in my book, but cost just as much as AW's. But really thats the only difference in cells is what protection circuit they slap on them.



I saw those, but they are sold out right now so i didn't check into if it is a good company to buy from or not.

It's where I bought the 2 I use in my LavaTube. I have had 3 orders with them & no problems.

 

[Java_Az]

Almost forgot to give the update on these Panasonic 18650 Li-Mn-Li-ion CGR18650CH High Drain 10A Rechargeable Hybrid IMR Battery Cell Ordered Late Saturday night, they were here on Wednesday. Real deal Panasonic's Quite impressed with them so far. They did raise the price a dollar on them but still not a bad deal @11bucks a piece free shipping.

To get back on topic going to try to finish the PCB design for these chips this weekend and post in here when i am done.

 

[WillyB]

They are OK, but using them with a tanked Boge 2Ω carto, my Tenegy2600s give longer vapetimes.

Good price here.

Panasonic CGR18650CH 2250mAh Li-ion Battery [Panasonic CGR18650CH] - $8.76 : Led Flashlight-International Outdoor Store

 

[Strontium]

International Outdoor is shipping from China.

 

[WillyB]

I know, good company with quick responses to questions. Bought from them before will buy again.

 

[skipdashu]

Well I finally stuffed all the stuff from the breadboard into a box and finished the VV FB2 - Final schematic HERE.

I'm pondering some other connection for the batteries instead of the magnets/tabs but the rest of it is working well so I sealed part of it with hot glue and am done with it. Yes, b4 ya'll rip me a new one, I know there's a bunch of extra wire in it. I did that so I had an easier time deciding where to mount things. My intent was to shorten several of them once component location was decided but it didn't happen.

Wires with load on them are 20~22AWG, others are 24~26AWG.

I also see why the guy who built the original blue box I had used an almost clear water based epoxy (but that led to some other problems).

Blue FB2_1
Blue FB2_2
Blue FB2_5
Blue FB2_6
Blue FB2_8

The larger switch is a 4A SPST power on/off that breaks B+.
The smaller switch is a SPDT with center off that controls the voltage display module (down is B+, center is off, top is regulator output). S/B the switches listed in Mamu's Dena how-to.pdf. The little sealed fire button is from madvapes.

I used a pair of 18350s because I had 6 of 'em not being used.

Blue FB2_switches
B+
Blue FB2_B+
Output
Blue FB2_Vout

Oh and for an idea on the size of the blue box... Mar31.

I've got one more of these regulators and now that I've proven to myself this all works I'll have my eyes open for something else to build these parts into.

Thanx WillyB & mamu for the original threads & posts to get it rolling. Thanx to all those who helped me along the way.

Skip

 

[WillyB]

So you be rocking now!

That box looks like a nice size, how bout a link?