Dropped 18650 - Keep or Discard?

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StorminMatt
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Dropped 18650 - Keep or Discard?

Last night, I went for my usual nighttime hike. It was quite chilly on my hike, and my hands were cold to the point that they didn’t work too well. So when it came time to swap batteries, I fumbled my Samsung 35E and dropped it to the ground. Unfortunately, the trail was rather rocky at that point, so the cell had a rough landing from a height of about 3-3.5ft. The wrapper is somewhat nicked. But as far as I can feel (with warm hands, that is), the can doesn’t seem to be dented.

When I got back home, I tested the cells some more. I drained both of my 35E’s to around 3.15V in my SC600w II and recharged them. I don’t have an analyzing charger – my VC4 is as close as I have. With that charger, the undropped 35E accepted 3197mAH, and the dropped 35E accepted 3226mAH. So charge acceptance appears to be fine with the dropped cell. Both cells charged to 4.18V (both measured after a few minutes of resting). It would appear that the cell is OKAY, at least at the time. But is a dropped cell dangerous? May it cause problems down the road, making replacement the best option? Or should I simply rewrap it (or maybe even not, since it represents nomshort circuit risk) and continue to use it? The cells are only a week old from Illumination Supply.

Without lamps, there’d be no light.

Edited by: StorminMatt on 11/30/2016 - 09:16
chadvone
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I would keep.

emarkd
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I’m sure its fine. If the insulation of the wrapper is compromised and makes you nervous you can always rewrap it.

Speed4goal
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If the wrapper is nicked id rewrap and keep. Ive dropped a handful of cells on ceramic tile and never had a problem.

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firedome
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As a precaution I always discard any damaged battery, but in this case i would keep.

“We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.

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ven
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Dropped many cells over the years, never had to throw out and never had an issue. As said re-wrap if required and just keep an eye on it at 1st when charging…………all should be fine imo.

atbglenn
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I’d keep it because it’s not dented. As far as the nicks in the insulation on a non-protected battery, I wouldn’t worry about that because the body of the battery, except for the tip, is negative just like most flashlight tubes. That said, unless you have a flashlight that the battery is inserted with the positive end towards the tail cap, I think it’s a non-issue

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will34
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Many of my batteries are like this. Some older cells have been dropped so many times they have to be reshaped to be able to still slide into the battery tube, maybe there is a minuscule capacity loss but definitely usable.

djburkes
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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. Wink

Jerommel
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I’ve had 2 18650 cells that totally stopped working after i dropped them on a concrete floor.
Others have survived just fine though.

2Q19

atbglenn
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Jerommel wrote:
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?

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BazzH
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Keep if not dented.

Jerommel
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atbglenn wrote:
Jerommel wrote:
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?

Unprotected.
They were both light blue Samsung ICR18650-20 laptop pulls.

2Q19

ven
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djburkes wrote:
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. Wink

+1 to that

How many feet can you get an 18650?

The Miller
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ven wrote:
djburkes wrote:
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. Wink

+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 Wink

Hmm, interesting to mark cell pairs with a wrapper, might just order a few of those, thanks for the link

Primal
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djburkes wrote:
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. Wink

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 Big Smile

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Enderman
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The battery looks perfectly fine to me, I don’t see anything wrong.

Firelight2
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ven wrote:
djburkes wrote:
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. Wink

+1 to that

How many feet can you get an 18650?

Woah … feet? Are you replacing the springs in your charger with extra-strong springs for more distance? Cool

SawMaster
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Does having a 10180 stovepipe in my charger count? That’s happened a few times here Blushing 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 Crying

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Jerommel
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Oops… Facepalm
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…

2Q19

Jerommel
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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?

2Q19

Lexel
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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

Jerommel
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Lexel wrote:
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 ! Thumbs Up Big Smile

Any idea how much of a gap that is?
Does it mean you can solder on it? (Just curious)

2Q19

Lexel
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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

jycheang
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Seen OK for me.
I will keep it except it look danger to continues use. Wink

everydaysurvivalgear
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When you drop a cell and make a dint you are making the cell smaller and that means you get less capacity lol Silly

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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.