The eLeafs I bought in January of 2015 have finally given out, one of them a few weeks ago, and this week the other two. They stopped holding a charge. 6.5 years, not bad. First I tried switching out with a new recharging cable and wall wart, which were equally old. Didn't help, so I had to ditch the old devices.
Somewhere along the line I hoarded extra eLeafs against the vapocalypse, more of the 30W, and then the 40W, so the one that died first was replaced by another 30W. This week I cracked open two of the 40W for the more recently deceased. The color of these was called "gray" when I bought them. In reality, the color is more like the "cadet blue" in the old crayola box, only metallic. I would have preferred black or stainless steel, but the "gray" was what I could get at the sale price at the time.
The 40W have some curious behaviors that vary from the 30W. For instance, they read my 1.6 ohms coils at 1.45 ohms, so I vape on those at 10.5 watts instead of 11. If I forget and try to vape at 11 watts, I'll get ghost hits, and I can almost feel the device seize up. I adjust to 10.5 watts, back to normal. These feel a little heftier in hand than the 30W. I'm wondering what those two slots on top are for.
Life is good. I ordered two more from PerfectVape, a black one and a silver one, to replace these I have subtracted from my hoard. I have always kept them in the fridge. Superstition or no? I don't know. I've always heard refrigerating batteries maintains stasis and keeps them new. I keep alkaline and independent lithium ion batteries in the
freezer. Fridge or freezer, you have to let them come to room temp on an absorbent cloth before using them.