Alarmingly hot lithium cells!

[iamdarkyoshi]

Interesting. I shall keep the lower capacity cells around as well as try some of the other ones (like the ones that come out of the packs at lower voltages, though they are usually 3 and higher or 2 and lower)

Maybe I will add some low current cell holders on my battery charger.

[iamdarkyoshi]

The TP4056 is the chip I will be using to charge the cells.

It has a pin for a temp sensor, so I can use that instead of the friggin bimetalic switches I bought. For frig's sake 

[ez24]

I got sixteen laptop batteries yesterday and tore them apart.

Just curious   Did you get 16 batteries or 16 battery packs?  If packs that is a lot of batteries.   How do you take them apart?  My Dells are hard to take apart, a lot of effort is needed (and band-aids)

[iamdarkyoshi]

I got sixteen laptop batteries yesterday and tore them apart.

Just curious   Did you get 16 batteries or 16 battery packs?  If packs that is a lot of batteries.   How do you take them apart?  My Dells are hard to take apart, a lot of effort is needed (and band-aids)

Battery packs. I get them from a PC repair store.

I have gotten lucky lately with their glue, but I do the following:

Take off any labels, often there is just a skeleton of the shell underneath.

Get your onehunglow sidecutters

Start at the corner and try to just nip into the top half of the case, if you are lucky and the glue is loose, you can peel most of the case apart like an old sardines can. If not, just keep nipping away at the plastic edges.

Once inside, carefully cut any wires going to the BMS in two places (so they don't have a chance of meeting each other again) If you can't get to it, then carefully remove the pack from the shell and place it on your electrically INSULATED desk. AvE's copper desktop would be a bad idea here.

Once the BMS is gone, snip off any wires sticking off. After this, fold the cells away from each other.

Cut the tabs, seperating it into each parallel pack. Then I usually cut the tabs that join each cell on the NEGATIVE side. The whole shell is negative, so trying to cut through the tabbing material can short them out to the shell if you nick the heatshrink.

You should now have two, three, or four cells joined on the positive end, unless you took apart a weird battery.

Grab two cells and pull until the tabbing wire breaks at the welds. Pull off any tabbing material left with a pliars, and then cut the sharp spotweld peaks down so they arent pokey. Or tap it on your workbench.

Repeat on the negative side if there is tabbing matetial left.

And you should be left with a bunch of batteries.

If you can find thinkpad g40 batteries anywhere, they are usually 12 cell packs using sanyo cells...

[ez24]

Thanks that is about what I do with my Dells (from my old computers)   I once saw a YT video of someone doing this and making power packs for an electric bicycle.

I think this is what I would do if I had a good source.

Did you say what you are doing with them?

What heat sensor are you going to use?

thanks

[iamdarkyoshi]

Thanks that is about what I do with my Dells (from my old computers)   I once saw a YT video of someone doing this and making power packs for an electric bicycle.

I think this is what I would do if I had a good source.

Did you say what you are doing with them?

What heat sensor are you going to use?

thanks

I am using mine in powerbanks or portable bluetooth speakers. As for the temp sensor, the TP4056 supports an NTC and resistor based temp sensor.

[ez24]

I am using mine in powerbanks or portable bluetooth speakers. As for the temp sensor, the TP4056 supports an NTC and resistor based temp sensor.

I was going to use mine for a powerbank but I do not have a big need and Makita came out with a 18v to USB adapter.  And I have several 18v Makita batteries, so I just use them now.  I do like the idea of a blue tooth speaker.