IIRC
@Rossum started a pretty decent thread, and discussion, on battery shelf life. I store new
batteries in the fridge charged at 3.6v. 3.5-3.7v is recommended for long term storage. Every few months I pop them in the charger and top them off at 3.6v if needed. When we receive new
batteries they are usually right around 3.6v. I have some pretty old 18650's that are still in use. As long as they hold an acceptable charge I don't see a problem and will continue using them.
Been thinking about stocking up and putting some batteries in the fridge just in case. Several people have said they last well that way.
I just got an Asmodus battery analyzer. My older batteries were in worse shape than I expected. I use a bunch of setups so I wouldn't notice if a particular battery wasn't holding a charge for long.
I just posted this somewhere else.
I'll take this battery analyzer stuff over to the battery forum when I finish testing all my batteries but here's a report on my progress so far.
Tested a selection of HG2's of various ages.
2 month old batteries - capacity around 2700, resistance 40mO
1 year old battery - capacity 2200, resistance 47mO
3 year old battery - capacity 997, resistance 56mO
So after 3 years, which is when I have been retiring batteries, the capacity is way down.
2 year old Samsung Q30 button top I got for Provaris - capacity 2485, resistance 115. The capacity seems pretty good. Checked the resistance on some others and the resistance ranged from 85 to 110. Wonder if some of the high resistance comes from the add-on button tops. No idea how they would have measured when they were new. Since Provape used to advise using low resistance batteries I might rethink the Samsungs.
5 year old AW 2200 button tops - capacity 1975, resistance 49. Seems like they are still in good shape. Haven't used them much since I got the Samsungs. Wish they were still around.