A friend gave me an old battery pack from a dell, he couldn't remember what the make or model was. Here's a pic of the pack, can you help me ID the mah of these batteries?
[IMG]http://i61.tinypic.com/15qu59g.jpg[/IMG]
I checked them all with a voltmeter and they read 3.74-4.1 but there was two batteries that read .41x. I'm assuming these are bad batteries?! I have already tore them apart and discarded the pieces.
can you get us pictures of the cells?
You will have 6 2400mAh batteries that are more than likely Panasonic.
Pic of of the cells, I tore the wrapper off of one that I'm discarding because I was bored. It's easier to read the writing on it. I wish I could figure out how to add pics to my posts.
thanks for the help!
Those are most definitely Sanyo cells. The style of the unique manufacturer code on the bare cell on the far left is the smoking gun! UR18650Fs?
With the new pic I see that those are not Panasonic. They are Sanyo.
Sanyo cells UR18650x
what color ring is at the positive terminal? red? blue? some other color?
Thanks for all your help! I got 4 good batteries out of 6, they charged up to 4.21/4.22/4.24/4.21 on the first charge! They have a green top inside the red coating.
Again thanks for all your replies! I'm loving this forum!
did you checked the capacity?
I got same 4 cells from 6 and they charged 4.20v but capacity was 500mAh @ 1A, 700mAh @ 0.5A
cells look like SANYO UR18650FM
Sanyo UR18650F R1112 cells’ specifications:
Rated capacity: 2400mAh
Minimum capacity: 2300mAh
Nominal voltage: 3.70V
Maximum charge voltage: 4.20V
Minimum discharge voltage (cutoff): 3.00V
Continuous discharge rate: 1C or 2.40A
Burst discharge rate (60 secs): 2C or 4.8A
Maximum charge rate: 0.5C or 1.20A