The place I intern at is dumping a lot of 'bad' batteries from a development project they did. Lots of these are labelled ' bad', but I know they arn't. There are 5 of these cells in each pack. Anyone think it is worth lugging home a 50 or 70lb box of them and testing them (voltage only) and using them / selling them cheap? They were just going to recycle them. Is there any interest in USED 26650 cells? I should mention these are the ones that can take 30 /40 A discharge rate for short periods...
26650 li-ion cells worth keeping?
- Thread starter havand
- Start date
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ynggrsshppr
Newly Enlightened
I would say it is worth hauling them back to base. I would be willing to buy some depending on their condition/price.
26650 is roughly "C" cell size correct?
26650 is roughly "C" cell size correct?
Diameter, yes. Longer. Regular C is something like 48mm long. These are 65mm long. 2 could fit in the place of 3 C cells. So, good for C cell maglite people.
rdh226
Enlightened
Fallingwater
Flashlight Enthusiast
I don't see why not.
Haha, don't worry! I brought home, not exactly counted mind you, what I figure is 100-125 cells that read 2.75 or better volts. many 3.75 or higher. I think i need to get one of those battery charger/testers that tracks capacity. I thought it might be neat to build an electric bike/motorcycle. (is that enough power for that?!) They're unprotected, however. So, I must be careful.
No you must be buying one of these if you want to make a pack and charge it safely. Unprotected cells can't be used in series without a protection circuit.
Thanks for the headsup, but I've used protection boards in the past. I just built a 11.1V pack with one. I really wish they'd set the overcharge protection on these things lower and the dead volt level high. 2.5V and 4.35V is crazy. Something more like 3.1V and 4.15 or 4.2V would be better.
No, no, don't apologize. I'd much rather have someone speak up and steer me in a direction, even if it's one I already know. Being unnecessarily warned is always better, just incase somone didn't know, than being blown up or burnt with 3 foot flames 
I wasn't talking about those boards specifically, just pcb protection boards in general. I just saw a post someone else made talking about how we need to revise that voltage figures for our new 'modern' protection boards.
I wasn't talking about those boards specifically, just pcb protection boards in general. I just saw a post someone else made talking about how we need to revise that voltage figures for our new 'modern' protection boards.
SilverFox
Flashaholic
Hello Havand,
Why are they marked bad?
If there is contamination within the cell, you could have some lively "issues" during charging.
If they have been damaged during use... same issues.
If they are simply being changed out because of age, then you may be on to something.
Approach this "opportunity" with caution...
Tom
Why are they marked bad?
If there is contamination within the cell, you could have some lively "issues" during charging.
If they have been damaged during use... same issues.
If they are simply being changed out because of age, then you may be on to something.
Approach this "opportunity" with caution...
Tom
