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Samsung ICR18650-26FM Cell Specifications
Warning: The information in this thread was obtained from various sources on the Internet, including any datasheets linked below, and is provided for reference only. It is not guaranteed to be accurate. To prevent fire or personal injury, never charge or discharge a cell before verifying the information yourself using the original specifications sheet provided by the manufacturer.

Capacity:2600mAh Rated
Voltage:3.70V Nominal
Charging:4.20V Maximum
1300mA Standard
2600mA Maximum
Discharging:2.75V Cutoff
520mA Standard
5200mA Maximum
Description:Pink Cell Wrapper
White Insulator Ring
18650 Form Factor

Data References:

None. Please submit some!
I found this cells in cheap Whitenergy Premium laptop battety. Well, i do not use it now in powerwall but today i am testing it. When i will be done i will post results.  Wink
OK, i tested 4 cells. 
I read 2500mAh. It was tested at 1.2A and 0.6A discharging with the same results.
Tested mine and came out at 2600 - 2900, with most falling in at 2700 - 2800 mAh at 1A discharge in Opus BT-C3100 tester. I got them out of an ebike battery.
I think the"M" means medical. I only find these in medical packs and they have the same characteristics as the F model. Also, the spec sheet for these day for model F/FM
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i found this:
  • Country of Origin: South Korea (F) or Malaysia (FM)
what do you think? can be fm the same as f, but made in malaysia?

today i am testing this cells again with new charger so i post new results soon.
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I can confirm finding these in laptop batteries. I have hundreds of them and never opened any medical-related packs.
These are pretty good -
here is a spec sheet:
                                ( o o )
|                                                                        |
|   Howie Grapek                        South Florida, USA               |
|   cell: 303.818.9414                  email:     |
|   phone: 561-819-9988          |
|                            .oooO                                       |
|                            (   )   Oooo.                               |
+-----------------------------\ (----(   )-------------------------------+
                               \_)    ) /

Here is another spec source with more info
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