mini mag AAA x2 mod
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That's not really a good choice for a Joye 510 mod. You are stuck using 10440 320mAh batteries. One will be overtaxed, and if you can get two in there (7V+) you will have to tone the voltage with either a resistor or a regulator.
If it's a 3.7V device you want one of the cheap often used flashlights would make more sense. You can easily get a 14500 (not ideal but much better than a 10440) or a 18500 1600mAh which will power a Joye atty quite nicely (a good often overlooked batt). It also does a decent job with the new LR atties.
3-1/2" Nine LED Flashlights, 2 Pack
And if you've only used your 510 with standard e-cig batt's the 18500 will up your power (watts/heat) by at least 40% while lasting as long as about 6+ standard 510 batts.
Ultrafire 18500 1600mah 3.7v PROTECTED BUTTON TOP Protected Rechargeable Lithium Battery Li-Ion UF18500
If it's a 3.7V device you want one of the cheap often used flashlights would make more sense. You can easily get a 14500 (not ideal but much better than a 10440) or a 18500 1600mAh which will power a Joye atty quite nicely (a good often overlooked batt). It also does a decent job with the new LR atties.
3-1/2" Nine LED Flashlights, 2 Pack
And if you've only used your 510 with standard e-cig batt's the 18500 will up your power (watts/heat) by at least 40% while lasting as long as about 6+ standard 510 batts.
Ultrafire 18500 1600mah 3.7v PROTECTED BUTTON TOP Protected Rechargeable Lithium Battery Li-Ion UF18500
So the 18500 batts will fit nicely in the flashlights in your link from harborfrieght? Thats a really good price!!! 
so theres no AAA size batts that produce 3v? im looking to try a 5-6v mod and i already have this thing built lol.
:edit:
i have an idea. if i can get 2 of them in there what i can do is put a thin spacer between the batteries and run them in parallel. just have to see how much clearance ill have in there
:edit:
i have an idea. if i can get 2 of them in there what i can do is put a thin spacer between the batteries and run them in parallel. just have to see how much clearance ill have in there
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That should work, but it'll still only be 3.7v. Just about double the mah through.
you can always use Low Resistance attys to imitate 5V vape on a 3.7.
with standard joye 510 atty:
3.7 v @ 2.4 ohms = 5.7 watts
4.2 v @ 2.4 ohms = 7.35 watts (fresh charge)
5.0 v @ 2.4 ohms = 10.4 watts
6.0 v @ 2.4 ohms = 15 watts
with Magnum Low Resistance atty:
3.7 v @ 1.5 ohms = 9.1 watts
4.2 v @ 1.5 ohms = 11.76 watts (fresh charge)
5.0 v @ 1.5 ohms = 16.66 watts
6.0 v @ 1.5 ohms = 24 watts (dead atty)
with standard joye 510 atty:
3.7 v @ 2.4 ohms = 5.7 watts
4.2 v @ 2.4 ohms = 7.35 watts (fresh charge)
5.0 v @ 2.4 ohms = 10.4 watts
6.0 v @ 2.4 ohms = 15 watts
with Magnum Low Resistance atty:
3.7 v @ 1.5 ohms = 9.1 watts
4.2 v @ 1.5 ohms = 11.76 watts (fresh charge)
5.0 v @ 1.5 ohms = 16.66 watts
6.0 v @ 1.5 ohms = 24 watts (dead atty)
No battery, fresh charge or not, vapes at 4.2V. And I would not consider 2.4Ω as a Standard Joye 510. Mine have always come in at 2.1-2.2Ω (two different meters).
question for you WB. if i have a cable between a charger and a battery is it gonna alter anyhow the charge on the batt? thanks!
If I understand correctly you are using a true charger (not a cell phone 'charger' which is actually just a power supply) which you've attached some leads, which run to your device's batteries? Should work fine.
Well, if you wanted to go with NiMH you could use 4, 1/2 AAA cells. You would get 4.8 volts in the same amount of space, and probably 3-400 mah. You'd need a new charger though, and I'm pretty sure that 1/2 AAA are scarce.
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