Overcharged a pair of 18650 batteries

[old4570]

@DasFriek

old4570- What charger you using to get the Samsungs too 4.35V?

I modified a Soshine SC-S2 , one channel now has adjustable voltage range [ termination ] , only problem is its not stable , has to be re-calibrated every time I use it or it will under charge or overcharge .. Details are over at the other forum ,

[xxllmm4]

I don't think they will short themselves out in water since they are low voltage but it might be worth a try

You may want to call before you bring them anywhere. I tried taking my recycle batteries to Walmart once and they looked at me like I was crazy, tried taking them to Ace hardware and they said only if they where in packs. However all the target stores I have been to have big bins in the front of the store for recycling, that's where I go now.

[Ford_Prefect]

If you are going to try to short them with water, remember pure h20 is more of an insulator than a conductor. Drop a tablespoon of salt in first, then the battery!

BTW Home Depot takes LiCo cells, at least in canada. They even provide plastic bags to prevent shorting out.

[Boaz]

@trooplewis

Boaz, you think they will take back batteries of a type that they do not even sell, i.e. Li-on?

there is an e-waste recycling center about a block from where I work, once the batteries calm down I'll bring them both there.

I have to admit, I contemplated dropping the 5.27v one in a big plastic cup filled with water, just to see how it would act when it shorted itself out...

Put them on E-bay ....sell them as higher voltage batteries than AW's .. Better yet put them up for sale on CPF,real batteries for real men ..

- the water wouldn't do a thing . the splash would be the most interesting part

[trooplewis]

NEWSFLASH!

I just got 10 batteries form Rev Jim, tested a couple and got...5.15v?????

Noticed the "Batt" warning light was on the DMM, put a new 9v battery in it, tested again and got 3.85v. Hmmmmm

Went and retrieved the 3000mAh batteries out of the plastic container the were in and tested again. One still read WAY low, 2v, but the other was right at 4.2v.

So sorry, but have to write this thread off as user error, actually two errors (1) leaving batteries in the charger for a week, and (2) Not being smart enough to realize my V-Ohm meter needed a new battery and was giving me poor readings. Sorry about the excitement of having an 18650 charged to 5v+ , you experienced guys must have sensed something was very wrong with that readout.

I feel pretty stupid, I suppose I should delete this whole thread, but I will leave it up so that when you think you're an idiot, you can always read it and realize you're still not that dumb.

So I'm tossing the undercharged battery, and keeping the 4.2v one. It's going into the V-Shark that only pulls 1.2A

[xxllmm4]

Thanks for letting us know! A lot of people would have just let it slide swept it under the rug.

I have to say almost the same thing has happened to me. Only mine was low voltage readings on my multi-meter.... Yep low batteries will do it every time!

[hank]

> my V-Ohm meter needed a new battery and was giving me poor readings.

You can go back and edit the original post. It’d save new readers from starting into this one, not quite finishing it, and getting the wrong idea.

[Rufusbduck]

@trooplewis

Boaz, you think they will take back batteries of a type that they do not even sell, i.e. Li-on?

there is an e-waste recycling center about a block from where I work, once the batteries calm down I’ll bring them both there.

I have to admit, I contemplated dropping the 5.27v one in a big plastic cup filled with water, just to see how it would act when it shorted itself out…

It’s like motor oil. If you want to sell it, you have to take it back when it’s used up.

[TrakTuned]

@trooplewis

NEWSFLASH!

I just got 10 batteries form Rev Jim, tested a couple and got…5.15v?

Noticed the “Batt” warning light was on the DMM, put a new 9v battery in it, tested again and got 3.85v. Hmmmmm

Went and retrieved the 3000mAh batteries out of the plastic container the were in and tested again. One still read WAY low, 2v, but the other was right at 4.2v.

So sorry, but have to write this thread off as user error, actually two errors (1) leaving batteries in the charger for a week, and (2) Not being smart enough to realize my V-Ohm meter needed a new battery and was giving me poor readings. Sorry about the excitement of having an 18650 charged to 5v+ , you experienced guys must have sensed something was very wrong with that readout.

I feel pretty stupid, I suppose I should delete this whole thread, but I will leave it up so that when you think you’re an idiot, you can always read it and realize you’re still not that dumb.

So I’m tossing the undercharged battery, and keeping the 4.2v one. It’s going into the V-Shark that only pulls 1.2A

The dying dmm sucked 1.3v from the cell

Anybody else feel paranoid everynow and then?!!?

I thought about building a little sheetmetal box just to eer on the safe side……abnormal?

[Rufusbduck]

I think everybody is that dumb once in a while. Fortunately, you only have to be a genius once to qualify. I read that in one of my favorite books. Darwin award winners skirt the other edge once too often. I suppose you could win the Nobel prize one week and a Darwin Award the next.