Cell balancer

[rocky79]

I am trying to build a cell balancer. the problem is how should i fool the charger that a cell is full. I understand that you have to use a power resistor to dump the excess charge in it. But how to size up the resistor? does it need to match the cell impedance?. and how to find that ? ( i have seen the previous designs but my question wasn't answered )
Thanks

[coro]

...the problem is how should i fool the charger that a cell is full.
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( i have seen the previous designs but my question wasn't answered )
Thanks
It is a problem with some chargers.. I have solved this - mentioned in text.
Look at my solution using linear mode driven fet transistor in series with pack.
Home page of my device, /I am sorry its in slovak language, but scheme and pictures should be clear and helpful: http://mujweb.cz/www/coro

Some words in english in DIY:http://www.rcgroups.com/forums/showthread.php?t=409195

Principe described WHY to do it: http://www.rcgroups.com/forums/showthread.php?t=388213