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So please excuse the little doodle was the best way I could think of making myself clear, then blue squares are the lithium ion 4.2 v batteries I have linked in series, now I have a charged that should* be able to charge 20/21v at somewhere around 2Ah, however I am running into a heat problem, the little dots I have drawn in the middle of the "cells" indicate their temperature to the touch after about 10-20 minutes of charge. I am wondering if this could be a problem with the particular cell, the size/resistance of the connecting wires, the charger being incompatible (there is virtually no information on it) or another option I have overlooked in my inexperienced clumsy eagerness. I have disconnected everything to be safe and would like to know the safest way to proceed and test from here. Much appreciated.

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    \$\begingroup\$ How are you balancing the cells? \$\endgroup\$ – Brian Drummond Dec 19 '17 at 19:16
  • \$\begingroup\$ read the voltage on each cell and report the 5 results back here \$\endgroup\$ – Neil_UK Dec 19 '17 at 21:35
  • \$\begingroup\$ 4.49, 4.31, 4.31, 4.21, 4.32 are the voltages on each cell, from positive terminal to negative terminal. I am not exactly sure, I did not know how or if I needed to balance them with the charger. \$\endgroup\$ – Kieran Davies Dec 19 '17 at 22:32

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