Free battery 18650.

[rangedunits]

so i messed up badly two 18650, i affraid to charge them.





They show as .2 volts and 2volts on my mmu...
They are Grey Trustfire Protected from DX, i believe they are a little over one year old.

If you are around montreal you can pickup them for free.....



If not, i will look for an eco center... or mail it to whoever want them.

 

[boscoj]

so are these the same dimensions as AA but just a bit longer?

be interesting to put them on a good RC car batt charger and see what happens, if they can be refreshed . . .

imagine the .2 v one is toast but worth a shot . . .

how did you mess them up?

 

[yobresal]

Nope, these are fatter and longer than AA and will not fit in AA slots. You are looking for 14500 batteries see here http://www.dealextreme.com/details.dx/sku.26124

 

[boscoj]

so do the numbers 18650, 14500 mean anything or are they just part numbers?

The driver, test load, power supply forum is a little thin on comprehensive battery data . . .

woot NAPA !!! I used to work at the track running an Audi Touring Car Team . . .

Nope, these are fatter and longer than AA and will not fit in AA slots. You are looking for 14500 batteries see here DealExtreme: $5.40 TrustFire Protected 14500 3.7V 900mAh Rechargeable Lithium Batteries (2-Pack)

 

[Prototype]

The numbers indicate diameter and length. The zero at the end designates that it is a round cell I believe. In theory an 18650 is 18mm across by 65mm long, a 14500 is 14mm across and 50 mm long and so on and so forth.

 

[boscoj]

thank you, measured an AA . . . 14x50 . . .

The numbers indicate diameter and length. The zero at the end designates that it is a round cell I believe. In theory an 18650 is 18mm across by 65mm long, a 14500 is 14mm across and 50 mm long and so on and so forth.

 

[rangedunits]

I guess i shorted them, while trying to fix my tailca[ switch.

 

[Razako]

It's (somewhat)easy to fix them. Just take some typical alkaline batteries and slowly charge them back up to 2.7. Then they can go back in their normal Li-ion charger. Make sure you keep them in a metal box or something while doing the re-charging process just to be safe.

 

[Sparkles]

How to prolong lithium-based batteries

"Some lithium-ion batteries fail due to excessive low discharge. If discharged below 2.5 volts per cell, the internal safety circuit opens and the battery appears dead. A charge with the original charger is no longer possible. Some battery analyzers (Cadex) feature a boost function that reactivates the protection circuit of a failed battery and enables a recharge. However, if the cell voltage has fallen below 1.5V/cell and has remained in that state for a few months, a recharge should be avoided because of safety concerns. To prevent failure, never store the battery fully discharged. Apply some charge before storage, and then charge fully before use."

Hope that helps. I believe some bad internal chemistries might be happening. Might want to research further or you could be setting yourself up for failure. A lot of PCB (Protection Circuit Boards?) will permanently shut off the batteries ability to charge at too low of a voltage.. If the manufacturer thinks its bad you might want to consider it as well.

 

[rhd]

It's (somewhat)easy to fix them. Just take some typical alkaline batteries and slowly charge them back up to 2.7. Then they can go back in their normal Li-ion charger. Make sure you keep them in a metal box or something while doing the re-charging process just to be safe.

Darn - I just tossed 12 that had this same problem, thinking they were toast. (registered around 2 volts, wouldn't charge any higher in my charger)

FYI - if anyone wants 18650s that suffer from the < 2V issue - and if that anyone happens to live in Toronto - head over to Active Surplus. They've got li-ion 18650s that are unbranded and have the <2V issue for $0.50 cents each.

 

[shhh]

i had a grey trust fire that went below. Threw it on the charger and it stayed lit green and never charged.

I took it outside and with a power cord
Plugged it up in a metal drum.
Checked on it a couple of hrs later, and it was good to go.
Been good for 5 months and thru 20+ charges.

 

[GBD]

i had a grey trust fire that went below. Threw it on the charger and it stayed lit green and never charged.

I took it outside and with a power cord
Plugged it up in a metal drum.
Checked on it a couple of hrs later, and it was good to go.
Been good for 5 months and thru 20+ charges.

So your saying you fed 120/240 VAC (mighty walljuice) into a battery for a couple of hours and it survived?

 

[Leodahsan]

@GBD
I HOPE he means that he charged the cell (with the charger) outside a long time and it went good.

 

[GBD]

@GBD
I HOPE he means that he charged the cell (with the charger) outside a long time and it went good.

Well.. Im pretty sure he doesnt mean raw mains.
I order sometimes very cheap (but somewhat okay) chinese lasers (mostly greens). almost all of them come with a no-name rechargable 18650 or the likes. Thats usually the fate those cells meet in my hands.
(mostly because its fun, and I dont trust my lasers to cheap no-name and unprotected cells.)

But not my SoShine cells... those get to live another day!

-Bro tip: Dont try to rapid charge no-name 18650's with several hundred amps @ 900V of capacitor power.

:beer:

 

[Leodahsan]

^
I like soshine aswell. Their AAA is better than the sonys I get here. Rated 900mAh tested @ 910mAh

btw.. get us some videos of your little experiments. And.. Have you ever thought about building a coilgun with those caps? :beer:

 

[GBD]

I suppose Ill upload some in the summer time.
I dont want to discharge that much power outside while its now half spring/half winter.. alot of water and ice melting.

I tried a coilgun already, so for railguns. I grew tired of it fast. These capacitors where meant to be used in a DRSSTC (tesla coil system) and for a single to 3 phase converter (variable freq driver).

I love Soshines though. A friend of mine recomended them to me and I loved these cells ever since. A bit pricy, but worth every penny IMO.