Electronics > Beginners

18650 beginners guide/introduction

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Terry01:
https://secondlifestorage.com/index.php

Try this buddy.

https://secondlifestorage.com/celldatabase.php

Here is some info on the cells  ;D

Rick Law:

--- Quote from: nemail2 on November 21, 2018, 09:31:59 pm ---Hi,

thanks for all your replies!

I have these batteries, unfortunately I didn't find anything on the internet about them.
They seem to have some balancer board integrated. The red one is the same as the black one but without the outer plastic (I removed that).

https://owncloud.ne-mail.net/s/3jmTYBpdpfx8J2X/download?path=%2F&files=20181121_222438.jpg
https://owncloud.ne-mail.net/s/3jmTYBpdpfx8J2X/download?path=%2F&files=20181121_222445.jpg
https://owncloud.ne-mail.net/s/3jmTYBpdpfx8J2X/download?path=%2F&files=20181121_222455.jpg

Will have to read everything a few times and google more and watch the video to master the batteries eventually and build my first practical things up (like DC-DC converter (step up/down) for powering things).

--- End quote ---

They looked exactly like the Sanyo's I got out of a Fujitsu laptop.  But red skin is not uncommon so they could be entirely different still.

If you look very closely on the red skin, there are very faint dot matrix ink jet printed numbers and letter on it on the side.  Look at my first picture , the one with only 2 cells, the top one doesn't have clear plastic cover.  Right at where the "6" is (where I consider batteries' top), look  about 2/3 of the way down (away from the "6"), you may find the faint numbers there.  On the bottom one, I have also installed a "protection board" (aka PCM).

From my research back when I first recovered them, they are 3.6V and not the typical 3.7V (the labels shown in the picture were wrong).  I lost my note book, so I am not sure how I got that.  I think I got the voltage from label on the laptop battery pack - the nominal total wattage/capacity and the list voltage.

They are pretty good cells (comparing to others of the same vantage I've recovered).  For half of them, they held to their nominal pretty good and delivers a good punch.   But I killed one of them by over-discharging them to below 2.4V (tested it before I install the PCM, and left it running all night, it was 0.0V in the morning).  It dropped from 2200mAH to about 400mAH after I "revived" it.

If your's are the same, check your first charge carefully (as you should always do anyhow).  I've a few that got hot after a while.  I left those alone without PCM, but I have not dispose of them yet.  I forgot about them, actually.

I took a second picture with 3 cells, I have labels which I want you to see (get hot) - I was not kidding about them possibly getting hot.  It is so close up that the closer one looks bigger than the others but that is just optical illusion.  Again, the voltage on them are wrong - 3.6V and not 3.7V.

Jwillis:

--- Quote from: Rick Law on November 21, 2018, 11:20:24 pm ---
--- Quote from: nemail2 on November 21, 2018, 09:31:59 pm ---Hi,

thanks for all your replies!

I have these batteries, unfortunately I didn't find anything on the internet about them.
They seem to have some balancer board integrated. The red one is the same as the black one but without the outer plastic (I removed that).

https://owncloud.ne-mail.net/s/3jmTYBpdpfx8J2X/download?path=%2F&files=20181121_222438.jpg
https://owncloud.ne-mail.net/s/3jmTYBpdpfx8J2X/download?path=%2F&files=20181121_222445.jpg
https://owncloud.ne-mail.net/s/3jmTYBpdpfx8J2X/download?path=%2F&files=20181121_222455.jpg

Will have to read everything a few times and google more and watch the video to master the batteries eventually and build my first practical things up (like DC-DC converter (step up/down) for powering things).

--- End quote ---

They looked exactly like the Sanyo's I got out of a Fujitsu laptop.  But red skin is not uncommon so they could be entirely different still.

If you look very closely on the red skin, there are very faint dot matrix ink jet printed numbers and letter on it on the side.  Look at my first picture , the one with only 2 cells, the top one doesn't have clear plastic cover.  Right at where the "6" is (where I consider batteries' top), look  about 2/3 of the way down (away from the "6"), you may find the faint numbers there.  On the bottom one, I have also installed a "protection board" (aka PCM).

From my research back when I first recovered them, they are 3.6V and not the typical 3.7V (the labels shown in the picture were wrong).  I lost my note book, so I am not sure how I got that.  I think I got the voltage from label on the laptop battery pack - the nominal total wattage/capacity and the list voltage.

They are pretty good cells (comparing to others of the same vantage I've recovered).  For half of them, they held to their nominal pretty good and delivers a good punch.   But I killed one of them by over-discharging them to below 2.4V (tested it before I install the PCM, and left it running all night, it was 0.0V in the morning).  It dropped from 2200mAH to about 400mAH after I "revived" it.

If your's are the same, check your first charge carefully (as you should always do anyhow).  I've a few that got hot after a while.  I left those alone without PCM, but I have not dispose of them yet.  I forgot about them, actually.

I took a second picture with 3 cells, I have labels which I want you to see (get hot) - I was not kidding about them possibly getting hot.  It is so close up that the closer one looks bigger than the others but that is just optical illusion.  Again, the voltage on them are wrong - 3.6V and not 3.7V.

--- End quote ---

I wouldn't worry to much since  Sanyo acquired  Fujitsu and  both were acquired by Panasonic .All three brands are likely made in the same plants.

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