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You are about to put 2 more subc cells to your pack.
Assuming it is 2 cheap ass subc cell laying around for a while.
The internal resistance of those individual cell will probably be higher that the one of a dog shit and will be the limiting pack performance. That doesn't take in account that the cells and the pack will not have the same balance between cells and the thermal shock your gonna give them while soldering with your probably vow of cheapness soldering iron.
In other words when its gonna be time to charge your pack, please do yourself a favor and don't let your pack chaging without surveillance and monitor the temp. If you can't hold it in your hand, stop charging, dispose safely and environmentaly and do yourself a favor to buy a cheap lipo and lipo charger (under 50$ for both) that gonna be a lot performance wise while still being in the vow of cheapness.
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