Quote:
Originally Posted by BrianG
Since then I redid the setup and wanted a single 4s2p pack, so I proceeded to take apart the pack to reconfigure it. The tabs used were substantially thinner than any other pack I have taken apart. I was able to separate the tabs of the "2p" cell pairs by hand, and without trying hard at all. That's not a solid solder job by anyone's standards. And, after bending the tab once, they started to tear. I ended up throwing that pack out. I still have the other 2s2p 8Ah pack, but I won't touch it.
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Now imagine that you have fixed at least 100 maxamps packs... I got pretty good at getting the bad cells out of the 2p packs (6000 and 8000 packs) and re-soldering them up. The tabs are at least 1/3 of the thickness of a comparable spec enerland pack, plus they have about 1/2 or less of the surface area where they are attached to each other. Fun to work with, and certainly not capable of conducting as much as the enerland tabs (regardless of the cell quality the tabs are attached to).
I have seen alot (like 50 packs or more) where 1 cell that was paired to another cell (2p config, like the 6000 and 8000 packs) would puff. No exterior damage to the cells, no shorting out, or anything else that could explain this save for the fact the cell was weaker than the cell it was paired too, and that weak cell was drawn past its limit. I have pulled out these "bad" cells and remade packs with the other cells and they have worked fine for many more cycles. So I can only come to the conclusion that the cells are not assembled to spec very well (poor QC) or the materials used in said cells vary in quality by a large margin.
That is 1st hand experince by me, nothing more and nothing less. I could hand anyone on the street a bare maxamps cell and a bare enerland cell and ask them to visually inspect them and tell me which is better. I know the result, as I have handled plenty of each cell. I have done alot of lipo work, but the majority of the maxamps packs i have handled needed cells removed, while I have mainly reconfigured enerland packs to suit the owners requirements. I have yet to puff or damage an enerland cell by drawing it too hard or pulling the voltage down.