Why is my battery getting so hot?

[jbash99]

Thanks everyone, I went and got a new battery today, and outs not getting hot at all!!!! So thank you all so much, I've learned a lot from all of you!!! Thangs Thamuch for everyone's in put!!!!! I appreciate you all taking the time to help a newby!!!!!! Thanks again
Jbash999

 

[Punk In Drublic]

Thanks everyone, I went and got a new battery today, and outs not getting hot at all!!!! So thank you all so much, I've learned a lot from all of you!!! Thangs Thamuch for everyone's in put!!!!! I appreciate you all taking the time to help a newby!!!!!! Thanks again
Jbash999

 

[stormjib]

@stormjib
Ohm's Law Calculator Insert any two known numbers into the online calculator and you will get the other two unknown numbers.

Yeah I get this, but the wattage chart that suggests that resistance (practically) doesn't affect amperage is what confuses me when applied to a variable voltage device. There aren't that many of them out there so probably it's moot, but an example. Dovpo Vee mod, dual series, variable voltage. Usually around 3.7-5 volts. Given that it's a regulated mod, albeit vv rather than vw, do I have to consider the resistance of my coil, or only the 'supply' side of the board? I hope this clarifies my question. I don't worry that I'm doing anything unsafe, but would like to match the best batteries to the mod.

 

[mac-nutty]

Thanks everyone, I went and got a new battery today, and outs not getting hot at all!!!! So thank you all so much, I've learned a lot from all of you!!! Thangs Thamuch for everyone's in put!!!!! I appreciate you all taking the time to help a newby!!!!!! Thanks again
Jbash999

excellent money saved

 

[DaveP]

now I don't understand 220w dual 18650 mods :/

I've never understood cars having 120mph speedometers, either. That's almost twice the speed limit in most places and certainly a dangerous hobby if you like to push a car to its limits.

 

[Punk In Drublic]

Yeah I get this, but the wattage chart that suggests that resistance (practically) doesn't affect amperage is what confuses me when applied to a variable voltage device. There aren't that many of them out there so probably it's moot, but an example. Dovpo Vee mod, dual series, variable voltage. Usually around 3.7-5 volts. Given that it's a regulated mod, albeit vv rather than vw, do I have to consider the resistance of my coil, or only the 'supply' side of the board? I hope this clarifies my question. I don't worry that I'm doing anything unsafe, but would like to match the best batteries to the mod.

Variable Voltage devices are no different to a Variable Wattage in that there is still a regulator chip involved. Like a VW device it will be the regulator circuit drawing current from the batteries based on the user power output and not the resistance of their coil. However, unlike a VW device we have to use the coil’s resistance within our calculations to figure out what that battery draw is. Unfortunately, I do not know of a quick and easy chart to this other than the calculator that Steam Engine offers.

Using a 0.5 ohm coil at 4 volts as an example, we have a 8 amp draw at the coil side. If we convert this to watts, which is 32 watts we can figure out the battery draw by using Watts per battery/Battery voltage/efficiency.

So with the above example and using 90% efficiency there would be 8.4 amps draw at a full battery 4.2 volts. And 11.11 amps draw at the usual 3.2 volt cut off.

 

[Eskie]

I've never understood cars having 120mph speedometers, either. That's almost twice the speed limit in most places and certainly a dangerous hobby if you like to push a car to its limits.

It's for the same reason it's on mods. Marketing.

 

[Rossum]

I've never understood cars having 120mph speedometers, either. That's almost twice the speed limit in most places and certainly a dangerous hobby if you like to push a car to its limits.

A speedometer is just a gauge, not a performance claim.

 

[mac-nutty]

I've never understood cars having 120mph speedometers, either. That's almost twice the speed limit in most places and certainly a dangerous hobby if you like to push a car to its limits.

that's what track days and the autobahn in Germany are for

 

[mac-nutty]

at least this thread has pointed out who to add to follow list and has educated the new guys

 

[greek mule]

Variable Voltage devices are no different to a Variable Wattage in that there is still a regulator chip involved.

Potenciometer I think is not considered regulator chip,it just bucks voltage in a series mod.

Like a VW device it will be the regulator circuit drawing current from the batteries based on the user power output and not the resistance of their coil.

In a VV mod like Dovpo M VV it is the resistance of coil/coils that determine current draw.In fact it is unregulated with safety features.The option to buck voltage doesn't make it a regulated device.

 

[Punk In Drublic]

Potenciometer I think is not considered regulator chip,it just bucks voltage in a series mod.



In a VV mod like Dovpo M VV it is the resistance of coil/coils that determine current draw.In fact it is unregulated with safety features.The option to buck voltage doesn't make it a regulated device.

My comments were not on a Potentiometer, but a regulated circuit. @stormjib brought up the Dovpo Vee which is a regulated variable voltage device. Current draw on the batteries, not the coil, applies in the same fashion as a variable wattage device.

 

[greek mule]

My comments were not on a Potentiometer, but a regulated circuit. @stormjib brought up the Dovpo Vee which is a regulated variable voltage device. Current draw on the batteries, not the coil, applies in the same fashion as a variable wattage device.

From DOVPO Site: "

After adding safety features and regulation capabilities to a mechanical vape device, cutting all the bells and whistles from a regulated device you normally see these days, we came up with the VEE."

To me it seems current draw depends strictly on the resistance of coil/coils.
There is a 35 A limit so a low resistance build will not be allowed to pull more amps.

 

[Punk In Drublic]

From DOVPO Site: "

After adding safety features and regulation capabilities to a mechanical vape device, cutting all the bells and whistles from a regulated device you normally see these days, we came up with the VEE."

To me it seems current draw depends strictly on the resistance of coil/coils.
There is a 35 A limit so a low resistance build will not be allowed to pull more amps.

Also on the Dovpo site.

"Instead of regulating wattage, you regulate voltage from 1.0v to 8.0v on the VEE."

Seem there is a lot of reference to the word “regulate” for an unregulated device.

Having a current draw limits does not mean the device is not regulated. Many regulated, VW devices even, have current limits.

 

[greek mule]

Also on the Dovpo site.

"Instead of regulating wattage, you regulate voltage from 1.0v to 8.0v on the VEE."

Seem there is a lot of reference to the word “regulate” for an unregulated device.

Having a current draw limits does not mean the device is not regulated. Many regulated, VW devices even, have current limits.

But you can't deny resistance is the major factor at current draw on a VV device.
And sorry if I keep you awake this late Toronto hour.

 

[Punk In Drublic]

But you can't deny resistance is the major factor at current draw on a VV device.
And sorry if I keep you awake this late Toronto hour.

0.5 ohm coil at 4 volts for a regulated variable voltage device equals the same as a 0.5 ohm coil at 32 watts on a regulated variable wattage device. For both the coil draws 8 amps

On the battery side both cases would draw 11.1 amps from a single cell at 3.2 volts at 90% efficiency.

increase the voltage to 6 volts with the same 0.5 ohm coil. This equals the same as 72 watts on a variable wattage device – current draw is the same as well at 12 amps

And again on the battery side both will draw 25 amps from a single cell at 3.2 volts at 90% efficiency.

And not to worry about keep me up

 

[Eskie]

I think the simplest way to think about this is you choose the wattage or voltage. That's what's delivered to the coil. The coil defines what the wattage or voltage is based on by what you feel is the best power level for the build. You build (or choose your drop in coil) based on what resistance will work best within the range/specs of your mod. In an unregulated/mech, the resistance is the only thing you can "adjust" to give you the vape you want. So in any form of "regulated" power delivery, you have two factors to adjust to give you your fave vape. In unregulated/mech, only one, the resistance of the coil.

 

[My Batt Hurts]

Sorry, couldn't resist the chance to chuck in a silly question. With VV, if you're using a stainless steel coil, will the vape tail off just a little as the resistance changes (presuambly increases)? Would that be more pronounced on something like ss430, with its slightly higher TCR? And if VW adjusts the voltage to maintain a set wattage, it wouldn't have as much to do if you're using (say) kanthal? So VW sort of implies resistance tracking, whereas VV doesn't?

Thanks.

 

[AttyPops]

I think the simplest way to think about this is you choose the wattage or voltage. That's what's delivered to the coil. The coil defines what the wattage or voltage is based on by what you feel is the best power level for the build. You build (or choose your drop in coil) based on what resistance will work best within the range/specs of your mod. In an unregulated/mech, the resistance is the only thing you can "adjust" to give you the vape you want. So in any form of "regulated" power delivery, you have two factors to adjust to give you your fave vape. In unregulated/mech, only one, the resistance of the coil.

Sorry, couldn't resist the chance to chuck in a silly question. With VV, if you're using a stainless steel coil, will the vape tail off just a little as the resistance changes (presuambly increases)? Would that be more pronounced on something like ss430, with its slightly higher TCR? And if VW adjusts the voltage to maintain a set wattage, it wouldn't have as much to do if you're using (say) kanthal? So VW sort of implies resistance tracking, whereas VV doesn't?

Thanks.

To me, the difference between VV and VW...is reading the ohms of the coil.

So for VV, it's SET. You set the voltage, and that's the voltage regardless of the coil ohms. Period.

But for VW, you need the ohms of the coil to do the wattage calculation....it adjusts the voltage dynamically depending on the instantaneous coil ohms to get to that wattage. So as the coil ohms change, so will the voltage. IDK how "instantaneous" the calc really is. But that's why VW devices sometimes "tick" when idle for a minute or four...they're sampling the ohms periodically, several times per second. But when firing...IDK, but at minimum it will use the last-known ohms value.

There may be some designed that actually measure wattage external/regardless of the coil, but that would take measuring volts and amps and having some math fun.

 

[Eskie]

Sorry, couldn't resist the chance to chuck in a silly question. With VV, if you're using a stainless steel coil, will the vape tail off just a little as the resistance changes (presuambly increases)? Would that be more pronounced on something like ss430, with its slightly higher TCR? And if VW adjusts the voltage to maintain a set wattage, it wouldn't have as much to do if you're using (say) kanthal? So VW sort of implies resistance tracking, whereas VV doesn't?

Thanks.

Well, in a mech the resistance increasing from say 0.5 ohm (cold) to 0.6 ohm isn't all that noticeable. It's still a hotter vape at the end of the draw. VW just means you set the wattage and the board delivers that to the board. It doesn't read the resistance dynamically to adjust the original power output. If it did, then you essentially have temp control, and after all this I don't think we want to open that can of worms.