Samsung 18650
- Thread starter ac0311
- Start date
Help Support Candle Power Flashlight Forum
Until someone more qualified answers:
None of these OEM batteries used in packs have short circuit or under/over voltage protection in them that I am aware of. It should contain a PTC device inside the cell itself to limit current draw, but this is only a last ditch effort to stop horrendous things from happening, not to be counted on to use the cells safely. IIRC I read a thread by Silverfox stating it could take something like 10 seconds for this to kick in.
The consumer type 18650 cells spoke of as protected here will have an obvious lump at the negative terminal of the cell with a printed circuit board and some components, and if you look carefully at the side of the battery you can see a thin terminal running under the heatsink to the positive.
With proper knowledge and precautions you can certainly use these, and even with protected cells, they should primarily be treated as though they were un-protected and the same precautions taken.
None of these OEM batteries used in packs have short circuit or under/over voltage protection in them that I am aware of. It should contain a PTC device inside the cell itself to limit current draw, but this is only a last ditch effort to stop horrendous things from happening, not to be counted on to use the cells safely. IIRC I read a thread by Silverfox stating it could take something like 10 seconds for this to kick in.
The consumer type 18650 cells spoke of as protected here will have an obvious lump at the negative terminal of the cell with a printed circuit board and some components, and if you look carefully at the side of the battery you can see a thin terminal running under the heatsink to the positive.
With proper knowledge and precautions you can certainly use these, and even with protected cells, they should primarily be treated as though they were un-protected and the same precautions taken.
LEDAdd1ct
Flashlight Enthusiast
Which charger are you using?
LEDAdd1ct
Flashlight Enthusiast
Have you verified that the charger terminates at the proper voltage? I myself would feel a little nervous using that charger on unprotected cells, but I'll defer to someone more knowledgeable on this one.
~4.2. I have seen some say 4.22 absolute max, and others 4.20
Main thing to worry about is a trickle charge, that you don't want. Wait for light to turn green, pull cells, check voltage. Most of my cheap chargers actually undercharge, which I can live with. If you haven't already, read the stickys at the top, check the sub forum Smoke and Fire, go to www.batteryuniversity.com and read, at least the lithium stuff.
Read this,
http://www.candlepowerforums.com/vb/showthread.php?t=106242
And at least the first couple posts of this, (if not more)
http://www.candlepowerforums.com/vb/showthread.php?t=201375
I don't really know what your level of knowledge is pertaining to li-co cells, so I apologize if any of that is old news to you.
Oh, and do pay attention to the 2C rule. Since I don't know what those particular cells are rated at, I am going to say don't put more than a 3 amp load or so on them. You could probably get away with a tad more, but don't over do it.
Main thing to worry about is a trickle charge, that you don't want. Wait for light to turn green, pull cells, check voltage. Most of my cheap chargers actually undercharge, which I can live with. If you haven't already, read the stickys at the top, check the sub forum Smoke and Fire, go to www.batteryuniversity.com and read, at least the lithium stuff.
Read this,
http://www.candlepowerforums.com/vb/showthread.php?t=106242
And at least the first couple posts of this, (if not more)
http://www.candlepowerforums.com/vb/showthread.php?t=201375
I don't really know what your level of knowledge is pertaining to li-co cells, so I apologize if any of that is old news to you.
Oh, and do pay attention to the 2C rule. Since I don't know what those particular cells are rated at, I am going to say don't put more than a 3 amp load or so on them. You could probably get away with a tad more, but don't over do it.
