Hey guys. Browsing eBay I stumbled upon this-
How would you feel about building a super slim 10s or whatever pack with these?? Has anyone done this? Is there a lot of risk involved directly soldering individual lipo packs??
Pretty inexpensive as well. Id be skeptical of the quality of the cells though, at that price point.
Most lipo cells have aluminum tabs, which means regular solder won’t stick to them, no matter how much flux you use. You can either spot-weld the tabs or get special aluminum solder and flux.
I’ve seen several builders that have taken apart multicell lipo packs to rearrange the cells into a thinner pack. It’s a delicate and involved process.
Lipos are fussy, delicate and always want to be on fire at the best times. I personally wouldn’t touch this project with a 10ft fireproof pole, but that’s just me.
I can’t comment on the quality or process as such but I’ve also been wondering whether this would be a good way to go if you were to build with lipos just because of how you could design the packs - and how slim you could get it to the deck.
I came across this video and quizzed the guy in the comments on the pack he was using and he evetually shared with me his build thread:
So totally doable.
I’d also be really intersted to hear others experience building with single cell lipos and any options for quality cells.
I’m certain that’s not a high discharge cell and its not that small to begin with, they’re what’s in the cheapo power banks Dimensions: 8.8 x 70 x 129 mm
http://m.globalsources.com/gsol/I/Lithium-polymer/p/sm/1148315774.htm
37wh for $7 hum… 
370wh for $70? Even if it’s low current rating, it still doesn’t sound very legit considering it’s lipo. Better spend your money on authentic cells like samsung 30q, it’s not worth the risk. 
The wires coming off of that lipo are already really thin and there isn’t even something like a C-Rate or current capability given in the specs, so i wouldn’t do an esk8 with that particular cell.
However on better Lipo cells it’s definitely possible to do so. I used that technique in my first build. But it’s really a pain in the ass, the lipos i had didn’t have a pcb to which the cells were soldered but instead they were spot welded together. Once i seperated them (shorting them a billion times in the process) i used aluminium based solder to tin the tabs with an even coat, then regular solder with flux to attach the wires. Worked out kind of well in the end although i would do a MUCH better job insulating and protecting everything the next time around.
Well tbh next time i will just go with 18650 cells since i don’t have old big lipos laying around anymore and spot welding seems kind of fun compared to this.
I agree with @scepterr on this one. Those look like power bank cells capable of only 1-2 amp discharge. The output wires are a dead give away.
If you wanna build a slim battery pack, use cells with higher discharge rate these won’t give you ‘power’. I really like building a slim pack and used hobbyking 5Ah 20C cells: https://hobbyking.com/en_us/turnigy-5000mah-1s-20c-lipoly-single-cell.html?___store=en_us I have a 10S1P and a 6S2P with these cells and works great.
