Crappy 18650 2400mah ultrafire performance, measured capacity 1350mah

[mzzj]

I just received 2 cells of ultrafire "quality" batteries from Kaidomain.com

Anyone else done measurements on these?

First cell gives out 2150mah with 1000ma discharge rate(termination voltage 2.7)
Second one... 1350mah. Now this is what I call repeatability!

 

[jsr]

Have the cells been cycled a few times? I've heard Li-Ion cells increase a bit in capacity as they're cycled a few times. I was looking into these cells, along with the two brands of protected 18650s offered on QCG.

 

[mzzj]

Have the cells been cycled a few times? I've heard Li-Ion cells increase a bit in capacity as they're cycled a few times. I was looking into these cells, along with the two brands of protected 18650s offered on QCG.

Weak one seems to lose a little bit of capacity every cycle I throw at it, better one(2150mah) stays the same or gains a little.

 

[Led_Blind]

Generaly li-on cells designed for high current operation will gain capacity, almost like stretching its leggs.

Anyway, that capacity is so low i would concider it DOA

 

[mdocod]

just use AW protected cells. they are worth a few extra bucks.

 

[chevrofreak]

just use AW protected cells. they are worth a few extra bucks.

AW's cells do seem to be excellent quality, so I would largely agree with you.

 

[mzzj]

just use AW protected cells. they are worth a few extra bucks.

Maybe I try AW next. I dont care about protection as I was planning to order more of these to use in laptop battery. I would prefer LG/Panasonic from some reputable dealer but postage to Finland is usually too much.

Any quality problems with _unprotected_ 2200mah AW cells? Measured capacity?