By the way Yasi, if you have a 2AMP wall wart you can use that pass thru anywhere in the house with a plug. You don't have to stay tied to the puter. .....But make sure the wall wart is at least 2amp.....I'm plugged into my computer with my passthrough right now and it sucks.
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Thanks, I be thinkin I just figgard oputs my design fer its. Now dat hard parts is drawin it on dere 
he keeps checkin to see it already and I ain't started paintin yets guess he wants me ta hurry up ! 
Ah... there's your problem right there... It's the person vaping that is suppose to suck and not the battery
Oh Okays, I just wanted ta let cha know iffin ya didn't alreadysThanks Aggies, I know, but the puter is where I sit most of time
it was already up in my browser!! sry!!!! 
That wasn't so very long ago ( maybe a week or two ) and they were only in the discussion/idea phase with from my understanding...
your such a sweet monkey, thank you 
Oh Okays, I just wanted ta let cha know iffin ya didn't alreadys
Ok... I can't stand it....
If the passthrough you are using has a good battery ( ie holds a charge so you can use it without it being plugged in )... you can certainly use the USB port on the computer... but if it doesn't have a battery or isn't a good battery... It isn't recommended and is likely to damage the computer port by trying to pull more current ( amps ) than the port is made for.
Computer USB ports, if they are following the standard... are only made to provide 500mah of current to the items plugged into them. Some ( not all ) of the newer computers can provide up to 1-1.5a ( 1a = 1000mah ) of current.
So let's cover a couple example settings...
at 4.2v with a 2.5Ω coil... your PV will need to have 1.68a of power.
at 3.7v with a 2.5Ω coil... it needs 1.48a
at 4.2v with a 2.0Ω coil... it needs 2.1a
at 3.7v with a 2.0Ω coil... it needs 1.85a
So... if your passthrough's battery is good... you should be ok using it since the USB port is only charging it and isn't being asked to provide all of the current the PV is needing to vape with.
If the passthrough you are using has a good battery ( ie holds a charge so you can use it without it being plugged in )... you can certainly use the USB port on the computer... but if it doesn't have a battery or isn't a good battery... It isn't recommended and is likely to damage the computer port by trying to pull more current ( amps ) than the port is made for.
Computer USB ports, if they are following the standard... are only made to provide 500mah of current to the items plugged into them. Some ( not all ) of the newer computers can provide up to 1-1.5a ( 1a = 1000mah ) of current.
So let's cover a couple example settings...
at 4.2v with a 2.5Ω coil... your PV will need to have 1.68a of power.
at 3.7v with a 2.5Ω coil... it needs 1.48a
at 4.2v with a 2.0Ω coil... it needs 2.1a
at 3.7v with a 2.0Ω coil... it needs 1.85a
So... if your passthrough's battery is good... you should be ok using it since the USB port is only charging it and isn't being asked to provide all of the current the PV is needing to vape with.
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