Life of Li-Ion Batteries

[Cool_Breeze]

I have two pair of Li-Ion 18350 batteries that I used stacked in a vv mod that I've made. These now have approaching a year's use on them. They still work, but the per charge life-cycle is approaching half what they were when they were new, or so it seems.

I'm wondering what the characteristics of Li-Ions are toward the end of their usefullness. Will they at some point pretty much lose the ability to take a charge, or will they continue to lose per charge life-cycle at a similar or faster rate?

 

[WillyB]

They still work, but the per charge life-cycle is approaching half what they were when they were new,

If you were using them in a single cell mod you would also notice your initial loaded volts and the cells ability to maintain them have suffered greatly.

I'm wondering what the characteristics of Li-Ions are toward the end of their usefullness.

Those cells sound far past my criteria for usefulness.

Folks try to attribute some magical longevity to certain brands. Time and use both take their toll on ALL batteries.

Take a peek at this test.

The read and green traces are two 18650 AW IMR1600 vs a high drain Panasonic, black trace. The AW's have lost a bit of mAh and the Panasonic seems to trounce it, for volts and mAh. But the reviewer did say the AWs were a year old but lightly used.

Now here is SuperT's test of the same cells, but new vs. new.

It's a different story now.

In the top test it looks like the old AWs would still be OK for use paired in a VV mod, having lost just a few hundred mAh. But in a straight single tube PV it's obvious that vaping performance would have suffered greatly from when new.