Circut board in a little 3s Zippy pack - RC-Monster Forums

Bondonutz · **Circut board in a little 3s Zippy pack -** 07.20.2009, 07:58 PM

I received a few packs from Hobby King/City and was getting ready to change the 3s packs to a heavier gauge Lead wire and discovered under the heat shrink a "circut board". Sorry if I live under a "Lipo Rock" but I never seen this befor or read about this. I'm sure they used a board to make in easier in some way or to add Efficiency.
It just made me go "Hmmm,thats interesting" and thought I'd share.
If this is old news then I apologize.

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Finnster · 07.20.2009, 08:17 PM

Its not a circuit board per se, its just a wafer on which to solder the batt tabs rather than just to themselves.

Bondonutz · 08:48 PM

Quote:

Originally Posted by Finnster

Its not a circuit board per se, its just a wafer on which to solder the batt tabs rather than just to themselves.

I'm hearing ya, I just didn't know what to call it ?

So this is fairly common for the smaller 3s packs ?
I've taken apart Eflight and TP packs this small and none had this additon ?

Finnster · 07.20.2009, 08:54 PM

IDK, I just know there was a silicon wafer on the 5S 4000 zippy pack I dissembled last night. Made putting the tabs back on easy, but getting them apart in the 1st place was a pain.

I think some other brands do this, but Linc would be the lipo master.

Bondonutz · 07.20.2009, 09:41 PM

Quote:

Originally Posted by Finnster

IDK, I just know there was a silicon wafer on the 5S 4000 zippy pack I dissembled last night. Made putting the tabs back on easy, but getting them apart in the 1st place was a pain.

I think some other brands do this, but Linc would be the lipo master.

Yeah, I was hoping Linc would be around sooner or later to add to this.
I'm really curious what the true intention of this chip is if it's other than ease of assembly or the attaching cells to each other ?

Sammus · 07.21.2009, 04:15 AM

All the zippie/turnigy/rhino packs I've had (about 20 packs in total) all have that.

My turnigy ones died the other day (25C 5000mah) which I was POed about, theyd only had about 5min easy running on them. I cut open the end and found the problem. See in your middle pic there is like an 'S' shaped blob of solder connecting the neg of cell 1 (ie cell with pos power lead coming from it) to the pos of the middle cell. The little thin connecting part had burned away, and so had the trace bit on it, so I couldn't solder it together by itself. I ended up cutting up some desolder braid to make a bridge between them.

Lucky it did melt, because my MMM died and shorted the battery and it acted like a fuse to disconnect the battery. In both pairs of packs I bought. I'm beginning to think it did it on purpose, now I'm afraid if something similar happens the solder will melt and the braid will attach itself to another tab and short one or two of the cells... hmm