NI-MH design for first Ecig build

[grimmson]

Hello all. Sorry for posting a volume but I want to be through. Got a vapor king starter kit to switch from a 2 pack a day analog habit to something different. Started smoking 50% analog, 50% digital, tried different mgs of nic and flavors and found my workhorse combo. 18 mg of wowboy should help me kick the analog habit. After two to three weeks of experimentation one of my batts are shot and the other doesn't get me by for long. If my math is correct I'll have a $40 battery habit a month and that doesn't really work for me.


I'd like to build a around the house workhorse vaporiser using the carts and juice from vaporking and rechargeable ni-mh batteries I currently have. My usb vaporizer was great but recently stopped working so I scavanged the threaded tip. I have a small cnc mill and a full size lathe so I think I can build anything.

1) Can I simply connect three batteries in series for the 3.7v (my batts are 1.4v charged so 4.2v).
2) connect a pressure on off switch.
3) Connect + to the center conductor of the usb fitting (using leadfree solder.)
4) Connect – to the outer connector for the usb fitting.
5) Make custom housing to prevent shorts

1. connect cart and vape myself silly?
2. Recharge loose AA batts individually as needed

Question one.
DO I NEED VOLTAGE OR CURRENT REGULATION IN THIS SETUP USING NI-MH????????


Most diy ecigs have circuitry and use lipo batts. I assume this is for charging and low voltage indication. The usb vaporizer has a small chip. It's automatic so I assume this is just an automatic switch to pass voltage during inhale. Are my assumptions correct? I know I have nichrome wire a fraction of an inch from my lips when I inhale. Nickel and chromium are both hazardous so I don't want to get heating the element wrong. This would be bad for me. I know.


According to my math the discharge rate for 3 batts is around C.45 . See below.


Question two
Batt life should be great? At 2500 mAh and C .45 discharge rate these batts are not being abused.


Question three
When the nichrome wire is heated how does it's resistance change? Does the LED used in most ecigs consume power so the batteries don't “see” a dead short? Because shorts are bad. Or does the wire retain enough resistance. I haven't worked with DC for a while and dont want to get this wrong.


Question four.
Since my batts are 1.4v can I use four batts to get 5.6v and still be safe? I thought the 5v usb ecig tasted better than the 3.7v stock battery. 5.6v is 12% hotter than the usb with no current regulation. I really don't want a hit of nichrome vapor so I thought I'd ask.


I apologize for asking questions that have already been asked before but I'd like to get back to vaping soon and I don't want to make a mistake.




This are my batts
Rechargeable Batteries & Battery Chargers - Tenergy Premium AA 2500mAh high capacity NiMH Rechargeable battery


This is my kit
Vapor4Life- Electronic Cigarette: Vapor King Ultimate Manual Battery Starter Kit
Is this the 501 battery everyone talks about?


Math Check Please. (If you see anything that scares you please let me know.)


Four of my carts ohmed out to 3.9 ohms when cold.
One ohmed out to 2.9 ohms when cold.


NI-MH batts info 1.4v charged and no load. 2500 mAh listed, 2200 mAh realistic.
I emailed the company for specs for the C Rating for discharge. For now lets assume C1 for saftey.
Mah/1000*C=Safe discharge rate
2200/1000*1=2.2 amps (seems safe)


A = v / r
w=v*a


For three batts
1.07a = 4.2v / 3.9 ohm
4.49w=4.2v*1.07a


For four batts
1.44a = 5.6v / 3.9 ohm
8.04w=5.6v * 1.44a
Warning - rechargeable batteries for mods

Mods built specifically to take the Ni-Mh standard 'main street' 1.5 volt* rechargeables available at local stores do not need any protection. These mods need 3 or 4 cells in series.
* These cells are 1.2 volt in reality

 

[classwife]

Welcome !!

This has a great "how to"......you might like it....for a simple box mod.......

Welcome to MadVapes LLC

I am sure drozed or switched will be along soon to help with the tech stuff !!!!!

 

[cappadoc]

Look in the modder's forum for the Puck. It uses 4 1.2V NiMH. I used the same concept to build a 3 AA cell NiZn box at 5.2 V initially, going down to 4.8V with use.

 

[grimmson]

Thanks to both of you. The puck looks very good. I think with the mill and lathe work I can make something sharp. It's electrically efficient and he hasn't killed himself in the last seven months. I really like that.

 

[VapingRulz]

After two to three weeks of experimentation one of my batts are shot and the other doesn't get me by for long. If my math is correct I'll have a $40 battery habit a month and that doesn't really work for me.

If you've only had your battery for a couple of weeks and it's not working, you may have gotten a bad battery. You really should contact V4L and they will replace it. I've had a couple of my batteries for over a year and they're still going strong.