Your worst lithium cells

[Oberfail]

I went through my rejected 18650's and came across a couple of weird cells. My 2 most weird cells are a pair of Panasonic CGR18650C cells, they hold very little charge and as soon as they hit 3.7 volt, their internal resistance increaes up to 2 Ohm.



What are your weiredst batteries you came across?

 

[floydR]

I had a 18650 that reversed polarity don't remember what brand it was. Yes i was measuring it right red to + and black to -. I have had paper wrapped cells 17670. A few LIFePO4 A123 26650 That popped their top while salvaging medical batteries zero volt well >2mv.
later floyd

 

[OffGridInTheCity]

A couple of hundred Green Sony G5/G7s - IR in 200-300mOhm - caused me much grief in early days till I drank @Wolf's cool aide (thank you @Wolf for IR work) and just set them aside to a 'world of their own'.

 

[Wolf]

till I drank @Wolf's cool aide

I was going to mention the Sony US18650GR - G4 through G8 but you beat me to it. I don't think they are bad cells just that they don't play well with others. If you put them in a sandbox by themselves I think they would be OK but mix them up with other brands not so much.

Wolf

 

[Dr. Dickie]

 

[Wolf]

@Dr. Dickie Now you are just showing off....
Wolf

 

[Tinkerer]

a while ago I took apart a knock off Ryobi pack and 1 of the generic cells were showing a full 4.2v of reversed polarity. Don't wanna know how many things had to go wrong for that to have happened.