18650's question

tja343

Newly Enlightened
Joined
Oct 30, 2007
Messages
30
not to familar with the rechargeables, but if you were to charge one and leave it in your flashlight for X amount of time, how fast would it discharge? like say you don't use your flashlight for a year after you have charged the cell, would it still have power left or be completely drained?
 

Fallingwater

Flashlight Enthusiast
Joined
Jul 11, 2005
Messages
3,323
Location
Trieste, Italy
It'd have most of its power left. LiIon cells have extremely little self-discharge.
If stored fully charged at room temperature it would, however, have permanently lost roughly 20% of its capacity due to natural degradation.
 

Burgess

Flashaholic
Joined
Apr 10, 2006
Messages
6,390
Location
USA
Good question, tja343 !


And thank you for that answer, Fallingwater !


:thanks:
_
 

mdocod

Flashaholic
Joined
Nov 9, 2005
Messages
7,544
Location
COLORado spRINGs
I've heard a good storage voltage is around 3.8V - 3.9V, which correlates roughly to about 40-60% charge.

If you want to have a li-ion cell in storage with the intention of it being ready for use in a power outage, or the like, then a good compromise is to store it at ~4.0-4.1V, It's a good balance between storage degradation and stored energy available.

However, to get the most from li-ion cells, they should be used at least somewhat frequently, if you are charging a battery less than once every month or 2, or if the intended use is emergency stored energy, CR123s would probably be more practical with their 10 year shelf life.

Eric
 
Top