Soldering charged battery cells.

[0lenny0]

Is there any danger soldering charged battery cells?
If it matters they are around 3.8V each,i don't know how much amps.

[Haunted360]

You should not, but since it is low voltage and possibly a small mAh, you can attach a heat sink to the terminal and then solder to it.



If it is actually a battery, and not a cell then you would want to spot weld on metal plates. If not, then solder but do not heat the battery up by holding the soldering iron there for more than 4 seconds!

[0lenny0]

You should not, but since it is low voltage and possibly a small mAh, you can attach a heat sink to the terminal and then solder to it.



If it is actually a battery, and not a cell then you would want to spot weld on metal plates. If not, then solder but do not heat the battery up by holding the soldering iron there for more than 4 seconds!

I'm not sure but i think they are Li-ion cells.
They came out of a laptop battery.
They have metal plates attached on the contacts.
http://img220.imageshack.us/img220/9782/hpim0524.jpg" onclick="window.open(this.href);return false;
http://img683.imageshack.us/img683/9776/hpim0523o.jpg" onclick="window.open(this.href);return false;
Sorry for the quality,taking my good camera for repair soon.

[Haunted360]

Ah yea, thats ok to solder to. Just don't hold it there for more than 4 seconds. The heat damages the cells and can explode (or maybe that was only for polymer...)

[0lenny0]

If it did explode then how big would it be?
Would it be any worse then some small burn marks?

[bicostp]

If you're just using a low-wattage soldering iron you don't have to worry about the batteries exploding unless you're trying to make them explode deliberately. Just work quickly and tack the wire on and you don't have to worry about it. Nickel-based batteries are more forgiving than Lithiums. (And if they're lithium, you need the supporting circuitry to safely use them. Improperly charge lithium batteries is far more dangerous than soldering to them.)

[0lenny0]

If you're just using a low-wattage soldering iron you don't have to worry about the batteries exploding unless you're trying to make them explode deliberately. Just work quickly and tack the wire on and you don't have to worry about it. Nickel-based batteries are more forgiving than Lithiums. (And if they're lithium, you need the supporting circuitry to safely use them. Improperly charge lithium batteries is far more dangerous than soldering to them.)

Thanks for the help.
Going to use my 30watt soldering iron.
The circuit is already ready.

[Haunted360]

Nono, it would not explode like KAAAAAAAAAAAA BOOOOOOOOOOOOOOOM!

I should have said 'Risk of explosion'

Rarely will they smoke, but in most cases they will do nothing. Afterwards it will not charge though as the cells are damaged...

Ni-Cd battery's are practically harmless and so are Alkaline and are as not of a high risk as Polymers. Those ones are freaky because they discharge fast.

I think in this video, he is adding a fair amount of power to it (over charging with high voltage). But, some cases have it that when they are shorted they can do this.


Hailrazer made a topic on this and he knows more about it... I don't know the link but Bicostp can help you...

[budnespid]

Tin the tabs quickly. Tin the wires. Heat the tabs and the wire at the same time to make a good joint. Just be sure to do it quick and you'll be fine.

[0lenny0]

Thanks for all the info.
I felt the plates(carefully) to see how hot they were and they actually take a good amount of time to get hot,i soldered it perfect and everything is working fine.
Once again thank you.