Battery capacity charts - updated January 2017 (*PICS*)

[dr_st]

Meanwhile, the even older Panasonic battery is still kicking is this T60 I'm typing on, although capacity degraded a bit as well.

And two days ago (five years after the previous post) this Panasonic failed as well. Aged almost 17 years, last recorded capacity was 34Wh.
Power Manager displays 86% charge, but "battery error has occured", cannot be charged, and laptop powers off immediately when not on AC.

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  Battery    FRU     Brand  Manufactured First used Measurement Age(months) Cycles Capacity (Wh) % Original    Notes
  T60-6c-1 92P1139 Panasonic  Jul-06       Aug-06     Jun-18       143       213       38.98        69.40%
  T60-6c-1 92P1139 Panasonic  Jul-06       Aug-06     Jun-23       203       234       34.00        60.54%     BATTERY FAILED :(

[kfzhu1229]

Kinda old thread now but I feel like I should add my experience with various battery manufacturers.
For Sony cells, I increasingly feel like their old cells behave well while their cells during and after the recall era age like milk.
Namely, Sony uses the model number US18650GR for decades, followed by a generation revision.
All my battery packs with US18650GR G1 (1997, 1400mah), G5 (2002-2005, 2250mah) are working, they have their wear ~50% but that's fantastic especially considering 27 year old cells.
The US18650GR G6/6A (2200mah, found on my T42 and newer) and G7/7C (2400mah) seem to age like milk however. I have 4 such sample packs each of them are in the "barely alive" condition, one pack is self discharging very quickly, 3 of them hold charge but works for a total of 1-3 minutes in their respective laptops. Not to mention the ones plagued by explosion (which I assume is G6).
And yes I find BMS with Sony cells tend to behave weird, though thankfully that T42 one is not giving me any issues. Two of them took a lot of "persuasion" after battery rebuild to have the full charge capacity bounce back up, one of them (Sony laptop) the gauge is behaving erratic probably because my replacement cells are too good in handling current.

Panasonic packs tend to age pretty well. But the 20+ year old packs tend to age worse than Sony G5 and earlier generations. Aside from that I have like one 9 cell that's dead when 3 of them leaked (but that's improper storage) and one 6 cell Toshiba that needed CID reset but now works fine, and one 6 cell Acer that's in "barely alive" condition, which stayed alive enough to survive rebuild.

Sanyo and LG tend to be middle of the road. I have a couple of each that work fine, a 2007 Sanyo that held 80% charge, a few 2010 Sanyos and LG that held 60-80% charge, two 2007 LG's that hold 30% charge but are functioning normally, but I also have a lot more "barely alive" Sanyos and LG's, including a Sanyo Acer battery that was actively spewing battery juice, but again survived just long enough for rebuild, a T61 LG battery that later died and was full of battery juice on the inside which failed and BMS locked sadly just before rebuild, and 3 of my A2x Sanyo batteries each holding like 2Wh of charge.

Samsungs are generally pretty good.

There was actually also another manufacturer called Simplo, I've encountered one inside a dead Dell battery but I don't have much experience with them.

The early 3000mah cells ~2011 era tend to age poorly from my experience, manufacturers push how low the battery voltage can discharge to before it's declared 0% charge and some even pushing 4.3V full charge, and then all but the 9 cells suffer greatly from internal resistance, regardless of Panasonic LG or Samsung.

I don't run calibration cycles on batteries that I did not rebuild (afraid of the FCC going down and not able to go back up and I find heavy discharges to be very harmful for old cells), nor do I run them below 3.5V per cell, so I don't have FCC info to share excluding the fully dead ones.