Quote:
Originally Posted by BillyBlack
That's a tough one. All Li-ions are partially charged from the manufacturer when shipped (not fully) as that's the nature of the technology. It's hard to say exactly how all e-cig chargers work, but Li-ions are not to be trickle charged once the proper 4.2V upper limit is reached (for 3.7V batteries).
It's also important to be careful when trying to use different chargers for various e-cig batts. A good example is the 'charger' supplied with the popular disposable 510 kits floating around. It's not really a charger (which would denote some sort of circuit to determine when to stop), it's just a power supply and even though standard Joye batts fit, it will destroy them if left on too long. It would appear the disposable batts themselves contain the shut off circuit. I believe M401 batts function the same way.
The same can be said for cell phone 'chargers', they aren't chargers, they are simply power supplies that supply power to the charger inside the phone.
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Actually the protection circuit for these batteries is inside the battery itself. It is called a PCM (protection circuit module). If you have ever taken one apart or took the little plastic end cap off, you will see a tiny round shaped PCB. This is the protection circuit module. It protects the battery from over charging, over dishcharging, or from running at more than the predetermined amperage. Most of these found inside e-cig batteries even have a little LED attached on the PCB.
As far as leaving them on a charger for too long, I leave mine on some times for days at a time, and these batteries I have had for going on a year now. They still work as good as new. But if the PCM ever goes out, this is when problems can and will occur. Which is why they recommend never leaving them unattended while charging.
Still I would agree that the safest way to charge these e-cig batteries, would be with a PCM protected charger. That way, if one PCM fails, there is still the second as a failsafe.
My only suggestion for e-smokers is to plug your charger in to a GFCI protected outlet, and place it on a fire proof surface, and never leave them unattended as I so often do.