So i just got 9 cells from a laptop pull, a dell lattitude d810.
Inside the battery casing was the date with year 2005 written. This pack doesn’t look like it was disassembled at all because it pretty much needs to be broken, even with softening the glue. It also looks original to the laptop since it’s plastic has aged very similarly.
There’s no way these are that old, since li-ion is supposed to only have 3 years life…right?
They are Sanyo 2600mah 18650’s (Red with green cap) and work great!
Four cells stayed to 4.15 after ~55hours
Three cells stayed to 4.13
Two cells stayed to 4.10
They stopped dropping after 24 hours but I wanted to be sure.
From my testing, just monitored discharge in my flashlight, the 4.10 cells show ~2200mah capacity…wonderful!
I also noticed each group of my similarly voltage cells have markings on the negative that match. Surprisingly to see different batches mixed in a laptop battery, and to see they also held very much different voltages.
They are probably from 2005, some of my first laptop pulls came from a old well used laptop around that age, the were Sanyo’s and they are still working great a year latter
:~ Why don’t you think are as old as the battery pack says they are?
Li-ions can certainly live longer then 3 years. Depends on how they are stored & how much use they have seen.
I remember reading somewhere that said li-ion usually only last 3 years no matter the charging/discharging, that will only shorten its time. But this was on the other flashlight forum.
Really glad I decided to still give it a go. Motherboard was fried so I had nothing for it anymore.
I am just doing a real inaccurate test by running my light on med mode, and measuring amp draw every 10 minutes or so and monitoring brightness.
I then account for about 10-20% higher ratings since my multimeter still has a fair share of resistance even with the 18 gauge speaker wire.