When To Discvard CR2 Batteries?

[breakfastchef]

I run x2 CR2 batteries in my Super-T2 and AdapteveR devices. These cells seem to start crapping out within two months of use. Over time, I have mixed in older CR2 cells with brand new ones. When the audible 'sizzle' subsides in my devices, I pull the batteries. Often one will read 3+ volts while the other (probably an older or weaker new cell) will read 2.3 volts. I tend to chuck anything that reads below 2.5 volts. Any comments would be appreciated.

 

[bigozone]

mis-matching CR2s is the leading cause of Venting-With-Flame.. it's far better to use matched pairs. by mixing old and new batterys you are asking for a reverse charge situation which can lead to the battery that was lower in voltage venting and even flaming...

before ordering my cr2s i sat and read this ENTIRE thread at candlepowerforums

and that poor guy was using PRIMARY CR123s (non rechargables) so if they can do this imagine how much easier it would be for rechargable CR2s to have issues or even VWF.

don't try to stretch the life of batterys by mixing old with new, and never mix fully chraged with partially charged batts.... these things are already iffy enough.

now i'm no expert but if your batts are comming off the charger at 2.5 toss them they are dying IMO

 

[breakfastchef]

My batteries come off the charger at 3.x volts plus. When they seem to run down, sometimes one cell might read 3.x volts while the second cell might read below 2.5 volts right out of my device. The lower reading cell may be older or new. My questions is whould I just pitch the low reading cell? Right now, I do so. I do not want lagging cells mixed in with stronger cells.

 

[bigozone]

your last sentence is exactly correct... but that doesn't mean tossing batteries, just keep the weaker ones for use with other weak ones when longevity is not required.

next time you get vastly different readings when removing cells could you take notice of which cell was lower in voltage?
from reading that thread i linked in my previous post i noticed that the cell closest to the atty was normally higher in voltage (atleast when inserted with positive terminals pointing toward head of flashlight)....
which brings to mind another good tip i've read here and on other forums--- always put batteries in the device with positive terminals (with vent holes) pointed away from the atomizer. (not much of a saftey tip especially if your PV is sealed, but if using a home made mod which way would you want the gas to vent?)

my thoughts would be to try to match batteries that discharge quicker with cells of similar characteristics. maybe save two of those lower reading cells, charge them and try using them as a pair. the main thing is to try to match batts inorder to prevent reverse charging.

short of buying a ZTS tester (or whatever it was called) there is no way to accurately determine the state of a LI battery and even this type of tester relies on an IC to compare the readings of the battery being tested to a database of readings of batteries of known status. (sounded kinda like voodoo when reading at CPF).

 

[breakfastchef]

just keep the weaker ones for use with other weak ones when longevity is not required...to try to match batts inorder to prevent reverse charging.

Excellent advice. I also noted that the cells nearest the atomizer generally had a higher voltage.

Since I use only unprotected CR2 batteries, I tend to be wary of over-depleting these cells. That is why I will generally throw a weak ones out. I will start makring my batteries again and divide them appropriately.

 

[RenaissancePuffer]

I have noticed this as well, one battery is always lower than the other. I use CR2's as well as CR123A's. I use both types in a series for higher volts.

Check out quovadis's thread here, it was discussed early last month.

http://www.e-cigarette-forum.com/forum/e-cig-technical-issues/41271-rc123a-tenergy-batts.html

 

[bigozone]

I have noticed this as well, one battery is always lower than the other. I use CR2's as well as CR123A's. I use both types in a series for higher volts.

Check out quovadis's thread here, it was discussed early last month.

http://www.e-cigarette-forum.com/forum/e-cig-technical-issues/41271-rc123a-tenergy-batts.html

thanks RP,, i'm always looking for battery info in reguards to ecigs.

edit:: and it looks like some of that info from reafing 750 posts in one thread has stuck with me