Battery charging

[tomkp]

So I have just completed my first mod build. A switch box with voltmeter. My question is on charging batteries. I have a switch on my mod that allows me to see the nominal battery voltage as they sit without hitting the fire switch as if checking them with a multimeter on both series and parallel modes. And when I hit the fire switch it shows a lower voltage while the fire switch is held. Now at what voltage should I charge my batteries?

As of right now (I've been using it a while) I turn on my voltmeter and it shows 7.83v and when I hit the fire switch it drops to 6.34v in series mode, and 3.75v with voltmeter and 3.55v when I hit the fire switch on parallel mode. I know on my eleaf istick 100, it stops working a 3.3v. I hope this isn't too confusing to read.

 

[Alexander Mundy]

So I have just completed my first mod build. A switch box with voltmeter. My question is on charging batteries. I have a switch on my mod that allows me to see the nominal battery voltage as they sit without hitting the fire switch as if checking them with a multimeter on both series and parallel modes. And when I hit the fire switch it shows a lower voltage while the fire switch is held. Now at what voltage should I charge my batteries?

As of right now (I've been using it a while) I turn on my voltmeter and it shows 7.83v and when I hit the fire switch it drops to 6.34v in series mode, and 3.75v with voltmeter and 3.55v when I hit the fire switch on parallel mode. I know on my eleaf istick 100, it stops working a 3.3v. I hope this isn't too confusing to read.

There is not a lot of energy left in lithium batteries below 3.2V though most have a minimal voltage of around 2.5V, so in practical usage they drop off pretty quick somewhere in the lower 3.X range.

 

[tomkp]

OK but the question still remains... what is a good voltage to charge at? 3.3v as the battery sits without load? 3.3v as I'm hitting the fire button?

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[Alexander Mundy]

OK but the question still remains... what is a good voltage to charge at? 3.3v as the battery sits without load? 3.3v as I'm hitting the fire button?

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That's up to you and your specific batteries. Look up the manufacturers minimum voltage and as long as you keep some headroom (say .25V) above that when firing your good as far as your batteries go. As far as practicality, in a non regulated it will be the point you can feel the vape dropping off to a point you are not happy with it. (Assuming you are still above the safe minimum discharge voltage) For me it depends on the mod (due to variations in voltage drop) and coil build. With a low voltage drop mod and HG2 batteries I find that point to be around 3.3V not firing. With HE2 batteries around 3.5V not firing. With a little more voltage drop in a mod or AW's 3.6V to 3.7V not firing. Stay above what the safe minimal discharge voltage is while firing and you will find that point that you say to yourself "I need fresh batteries".

 

[tomkp]

That's up to you and your specific batteries. Look up the manufacturers minimum voltage and as long as you keep some headroom (say .25V) above that when firing your good as far as your batteries go. As far as practicality, in a non regulated it will be the point you can feel the vape dropping off to a point you are not happy with it. (Assuming you are still above the safe minimum discharge voltage) For me it depends on the mod (due to variations in voltage drop) and coil build. With a low voltage drop mod and HG2 batteries I find that point to be around 3.3V not firing. With HE2 batteries around 3.5V not firing. With a little more voltage drop in a mod or AW's 3.6V to 3.7V not firing. Stay above what the safe minimal discharge voltage is while firing and you will find that point that you say to yourself "I need fresh batteries".

Thank you. That answered my question

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