AW IMR 18350 question...
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So Lemmie get this Straight...
You want us to drain our batteries Below some Amount to get the Max mAh Life Span Wise?
Got Any Minimum Voltage Limits or should we Just Shed the Pole Electron Wise and Screw the Chemical Differential ?
Perhaps you could Quantify Some Minimum Voltage that YOU think is safe to Drain a Battery Repepeativly for us who do not Understand the subtitle Interaction of Electrons Across a Potential Field?
Typically 3.0V is a safe level. They usually start falling off pretty quick 3.3 to 3.5V so you don't gain much by taking them any lower.
For an unregulated mod, when the voltage falls off enough to really notice, that's when it's time to recharge.
For a regulated mod in can be a little tricky since you either have to rely on a cell's protection or incorporate some kind of regulator cut-out for non-protected cells. Some of the switching regulators have a built in under-voltage lockout that does the trick.
For an unregulated mod, when the voltage falls off enough to really notice, that's when it's time to recharge.
For a regulated mod in can be a little tricky since you either have to rely on a cell's protection or incorporate some kind of regulator cut-out for non-protected cells. Some of the switching regulators have a built in under-voltage lockout that does the trick.
Yeah... I was expecting the mini this week, but I guess it got held up in customs argh! But yeah, my PV gets hot more often than normal. Which is why I always take the battery off after every few puffs...
Table copied for an AW seller's thread and available many places online.
This is open voltage.
It can be confusing when people post about open voltage and voltage under load. Two different numbers but important. I've asked this question elsewhere and the answer was that the 3.0 voltage is under load may be harmful.
"Recharge as soon as possible when you have run them down. Storing a depleted ( less than 3.6V open voltage ) battery may damage/ shorten life/cycle permanently.
LiIon Battery Charge Status
4.2V – 100%
4.1V – 87%
4.0V – 75%
3.9V – 55%
3.8V – 30%
3.5V – 0%"
This is the way I understand it. Others may have a different idea.
This is open voltage.
It can be confusing when people post about open voltage and voltage under load. Two different numbers but important. I've asked this question elsewhere and the answer was that the 3.0 voltage is under load may be harmful.
"Recharge as soon as possible when you have run them down. Storing a depleted ( less than 3.6V open voltage ) battery may damage/ shorten life/cycle permanently.
LiIon Battery Charge Status
4.2V – 100%
4.1V – 87%
4.0V – 75%
3.9V – 55%
3.8V – 30%
3.5V – 0%"
This is the way I understand it. Others may have a different idea.
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That's a good point to bring up. There can be a considerable difference between voltage under load and open circuit voltage.
Li-Ions should be stored long term at 3.8V open circuit, so yes, they should not be stored under 3.6V open circuit.
I don't believe 3.0V under load will damage them, but I haven't tested that myself on the bench. I've done many discharge tests with LiPo flat cells and have not observed any loss of capacity draining them as low as 2.7V under load. I know the ICR cells can be drained as low as 2.7V under load without damage and the Panasonic 3100mAh cells can go as low as 2.5V without damage.
Li-Ions should be stored long term at 3.8V open circuit, so yes, they should not be stored under 3.6V open circuit.
I don't believe 3.0V under load will damage them, but I haven't tested that myself on the bench. I've done many discharge tests with LiPo flat cells and have not observed any loss of capacity draining them as low as 2.7V under load. I know the ICR cells can be drained as low as 2.7V under load without damage and the Panasonic 3100mAh cells can go as low as 2.5V without damage.
Don't think I'll even try it but I wonder if I could get any vapor at 2.5 - 3.0.
I have some of these 3100 and IMR 2250 Panasonics. They last quite a while for me and I just take it easy on them and top off often.
Someone here gave me some advice [kind of scolded me really] but he was right. Buy good batteries.
From what I've seen on some other forums, there is a lot of overstating capacity for many of these batteries.
Manufacturers do it and many suppliers pass that on.
People here are getting smarter about these things though.
Thanks for your input Craig. I've learned a lot from you.
I have some of these 3100 and IMR 2250 Panasonics. They last quite a while for me and I just take it easy on them and top off often.
Someone here gave me some advice [kind of scolded me really] but he was right. Buy good batteries.
From what I've seen on some other forums, there is a lot of overstating capacity for many of these batteries.
Manufacturers do it and many suppliers pass that on.
People here are getting smarter about these things though.
Thanks for your input Craig. I've learned a lot from you.
Thanks everyone-I've learned a lot reading this thread; I'm new to removable rechargeable batteries, and I had some questions that have been answered so I won't have to start a new thread. I have 2 UltraFire 16340's and 1 AW 18350, and I decided I'd better monitor them with my multimeter, and they all came out at 4.2v charged, which I thought was odd since the 16340's say 3.6v on them and the 18350 says 3.7v, but that seems to be okay, and I don't let them fully discharge before I recharge them-just until I see a noticeable drop in vapor production, which also seems to be okay. I do have one more question though-does this mean with fully charged batteries I'm actually vaping at around 4v, or do I lose half a volt in the PV circuitry?
It's normal for them to charge to 4.1-4.21 and your OK with this and it is what your vaping at less whatever the load drop is
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