Charging Batteries

[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.

 

[dr_rox]

If you want the most life out of the batteries and safer charging, take the batteries out and charge them out of the circuit, individually. Otherwise, build in a couple of jacks and balance charge them with a hobby lipo charger. Boeing found out the hard way about charging series packs, serially.

A fully charged battery is 4.2 volts, so in series you should be seeing a no-load value of ~8.4.

You can do it with a single plug if you make your own cables.

 

[Jon@LiionWholesale]

If you want the most life out of the batteries and safer charging, take the batteries out and charge them out of the circuit, individually. Otherwise, build in a couple of jacks and balance charge them with a hobby lipo charger. Boeing found out the hard way about charging series packs, serially.

A fully charged battery is 4.2 volts, so in series you should be seeing a no-load value of ~8.4.

You can do it with a single plug if you make your own cables.

+1

4.2V per battery. Charging to 4.1 will extend the life of your batteries, but you'll lose a lot of capacity so for most people you want to just charge to 4.2.

 

[NemesisVaper]

From how this reads, tomkp is asking at what voltage should he take his batteries out and charge them.

Most of the high drain 18650s we use are charged to 4.2V then drained to 2.5V under load to reach their stated capacity. This should be the minimum voltage to run them down to. This would be when you're reading voltage on your mod with the fire button pressed and an atty attached. The resting voltage will be higher, it depends on the atty resistance as to the difference between resting and under load voltage.

Most of my cells go on the charger at around 3.4V give or take, and that's resting voltage. I'm guestimating 2.7V under load using a 0.18ohm stainless steel build. That may be over estimating voltage drop slightly.

 

[tomkp]

From how this reads, tomkp is asking at what voltage should he take his batteries out and charge them.

Most of the high drain 18650s we use are charged to 4.2V then drained to 2.5V under load to reach their stated capacity. This should be the minimum voltage to run them down to. This would be when you're reading voltage on your mod with the fire button pressed and an atty attached. The resting voltage will be higher, it depends on the atty resistance as to the difference between resting and under load voltage.

Most of my cells go on the charger at around 3.4V give or take, and that's resting voltage. I'm guestimating 2.7V under load using a 0.18ohm stainless steel build. That may be over estimating voltage drop slightly.

Thank you. That's exactly what I was asking

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