Sony 18650GR?

Batteries and Chargers Rechargeable Batteries
1

So I’m cleaning out my battery inventory after buying 18 Sanyo 18650GA and found some mysterious green batteries. They came out of a battery pack for a Sony Vaio laptop I found at the thrift store. The wrap is translucent vivid green like a leprechaun’s jacket, black top cap ring, 3 spoke positive terminal and have some markings on them.

First line SE US18650GR
Second line T 7C11JPF21G with what looks like a backwards RU on the end.

No other markings or codes. The negative terminal isn’t flat, but has a raised inner part like a big, flat button.

I checked the web and they are a dead giveaway for Sony 18650GR’s, but I dont know the capacity as they don’t have a G followed by a number to designate capacity.

Any idea on the capacity? I will eventually capacity test them, but wanted to get a benchmark so I can see how many electrons have escaped over the years…

Thanks

2

These are 2100mAh cells.

Very common for laptop packs.

3

Only 2100? Rats I was thinking the ‘7’ may have designated 2550. They are around 2008 or 2007 vintage I think. When I got them two were dead beyond salvaging, but I got 4 that weren’t completely dead like the other laptop batteries I harvest. I’ll probably stick them in a power bank someday.

Thanks

4

Sorry, but all are in error concerning the Sony GR-Gx Series cell capacity (“x” designates the model revision number which has its own capacity but still a continuous maximum current discharge of 2 times its internal load ie 2C, except those in Gx “D” where it is 3C):
US18650 “x”:
x (mAh given for Nominal Capacity):
GR-G1x: 1400 mAh
GR-G1D: 1250mAh
GR-G2x: 1600 mAh
GR-G2D: 1450 mAh
GR-G3x: 1800 mAh
GR-G3D: 1650 mAh
GR-G4x: 1950mAh
GR-G4D: 1800 mAh
GR-G5x: 2150 mAh
GR-G5D: 2000 mAh
GR-G6x: 2200 mAh
GR-G7x: 2400 mAh
GR-G8x: 2600 mAh
GR-GH1x: 2800 mAh (class of cells intended for the same uses, but chemistry totally different because Nominal Voltage of 3,75v instead of 3,6v and Maximum charge voltage of 4,30v)

5

Awesome so how can I translate all of the above for my batteries? These ste as ambiguous as those Sanyo red ones with the red insulator!

6

Use the two lines of codes printed on wraps of your Sony Cells… I do not see what’s complicated, and on the contrary: I love Sanyo but their old system with wraps and insulators colors and thermal printing for the model code and the datecode, that’s boring and especially complicated.

7

I ran a capacity test on the 4 cells with my Zanflare C4. One was 1660 man, second was 1917man, third was 1820mah, and the 4th was 1860mah. So it seems like these lives a hard life or they were low capacity to begin with.