If the tension spring on your charger hasn’t accidentally slung a cell across the room when taking the cell out of the charger then you’re not a flashaholic, lol. 
I’ve had 2 18650 cells that totally stopped working after i dropped them on a concrete floor.
Others have survived just fine though.
Were they protected or non-protected? Maybe you damaged the protection circuit?
Keep if not dented.
Unprotected.
They were both light blue Samsung ICR18650-20 laptop pulls.
+1 to that
How many feet can you get an 18650?
hahahaha I actually had one jumping out of the charger the other day. but i aught it with y left hand while it already had passed me on the way down (neven know I could be this fast
Hmm, interesting to mark cell pairs with a wrapper, might just order a few of those, thanks for the link
Ha Ha Ha. I just spit my mouth full of water out laughing at that one. I’m NOT the only one. Good one my friend 
Wisest thing my daddy ever taught me who was the best engineer I've ever known.
"Son if it ain't broke don't fix it"
My dad 1986
The battery looks perfectly fine to me, I don’t see anything wrong.
Woah … feet? Are you replacing the springs in your charger with extra-strong springs for more distance? :sunglasses:
Does having a 10180 stovepipe in my charger count? That’s happened a few times here 
Wee little beasties those are in a big charger bay.
I must sadly report the loss of another of my LiIon cells, a 14500 this time. It was in my SK68 clone and dim, when the light shut down I thought I’d clicked it off but apparently I hadn’t. Later in my VC2 it read “0” volts and my DMM showed 0.007V. Shame on me- and it was an Efest too :cry:
Phil
Oops… :person_facepalming:
Dropped a rather new Panasonic 3400mAh on the tile floor here today from about 3½ feet high…
Ugly dent in tail…
It’s doing the NOR test in my Liitokala charger as we speak.
Reading 2173 mAh at 3.52 Volts now, so it seems to be okay…
I don’t know what the separator is and where it would be located…
And how do i find out if it’s prone to fail?
High current discharging?
Small dents on the bottom are not too critical as there is a small gap between the foil pack and bottom
On the side its a lot more dangerous
I hoped someone was going to say that ! :+1:
Any idea how much of a gap that is?
Does it mean you can solder on it? (Just curious)
this is a picture from a cell before assembly
You can see that the seperator is longer than the lithium foils
I am not sure but that contact is most likely welded at factory to the bottom of the cell
Seen OK for me.
I will keep it except it look danger to continues use.
When you drop a cell and make a dint you are making the cell smaller and that means you get less capacity lol 
According to INR18650-35E specification paper
Drop Test
Test method: Each fully charged cell or battery is dropped three times from a height of 1.0 m onto a concrete floor. The cells or batteries are dropped so as to obtain impacts in random orientations. After the test, the sample shall be put on rest for a minimum of one hour and then a visual inspection shall be performed.
Criteria: No fire, no explosion (Test shall be performed with the following criteria IEC 62133)
Heating Test
Test method: To heat the standard charged cell at heating rate of 5°C per minute up to 130°C and keep the cell in oven for 10 minutes.
Criteria: No fire, and no explosion.
Overcharge Test
Test method: To charge the standard charged cell with 12V and 3C(10.2A) at 23°C for 7 hours.
Criteria: No fire, and no explosion. Overcharge test shall be performed with the UL1642 standard
Vibration Test
Test method: As to the UN transportation regulation(UN38.3), for each axis (X and Y axis with cylindrical cells) 7Hz→200Hz→7Hz for 15min, repetition 12 times totally 3hours, the acceleration 1g during 7 to 18Hz and 8g (amplitude 1.6mm) up to 200Hz.
Criteria: No leakage, with less than 10mV of OCV drop
External Short-circuit Test
Test method: To short-circuit the standard charged cell by connecting positive and negative terminal by less than 80 ± 20mΩ wire for 3 hours.
Criteria: No fire, and no explosion.