Derek Dean
Flashlight Enthusiast
As always with CPF, I too have learned a lot from this thread. Thanks for sharing your experience with us, cheaperrooter : )
cheaperrooter;5043075[B said:]Actually...I am a very stupid man!!![/B] Spent most of my day trying to figure out what the voltages are on a new CR123a, when I remembered I ordered 100 new surefires, and all I had to do was test them!
SMH at myself in shame. I'm just glad I figured that out before anybody out there in candleland did
Ok, so new is 3.25. So in other words my Duracell's have not lost ANY voltage as they are the exact same as my NEW surefire. And the titanium's are only 3.10.
Hmmmmmmm. Wondering now if maybe I have something going on with my thermal imager and its draining batteries much faster than it should???
Lithium chemistry involves passivation. When the layer is thin it offers the benefit of extended shelf life. When the layer get thicker it can interfere with performance.
Here is an article that talks about this.
Tom
That was interesting and answered a puzzle I encountered. I have a coin cell light (2 x CR2016) that sat in a drawer for a few years. When I tried using it again, it was about as bright as the dimmest firefly mode on any flashlight I own (0.1 lumen), despite measuring 3V on each battery. They must have had a fairly heavy passivation layer, and the low current the light was drawing under those conditions probably wasn't enough to remove the layer.Lithium chemistry involves passivation. When the layer is thin it offers the benefit of extended shelf life. When the layer get thicker it can interfere with performance. Here is an article that talks about this.
[...] the linked reference stated LiCl chemistry which is not rechargeable
[...] Do you have any data that supports passivation is not an issue with rechargeable lithium cells?
[...] I have actually witnessed similarities in the passivation layer in primary and secondary cells related to the cells performance during testing. When subjected to a load a primary cell with a passivation layer will show higher impedance which results in a dip in the voltage under load curve. I see the same dip in secondary cells that have had the opportunity to develop a passivation layer which is the SEI layer. Both types of cells improve after the passivation layer is burned off [...]
Let's see now... You are correct that LiCl is not a chemistry but forms as a degradation of the electrolyte. Thanks for pointing that out.
However, in your zeal to protect the person that suddenly stumbles on this thread, do you think that when they look up LiCl and passivation they will be pointed to primary or secondary batteries?
In the interest of protecting anyone who stumbles in here should we also add that stored energy can be dangerous? Or is that too obvious.
I have actually witnessed similarities in the passivation layer in primary and secondary cells related to the cells performance during testing [...] I wonder how something similar would work with secondary cells? For example storing secondary cells at the less than optimal voltage of 4.0 volts will result in the SEI passivation layer forming. Can periodic loads be applied to offset the growth of this layer?