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  • Cheap protection for Li-Ion single or series multi-cell applications

    posted by Firedog91902 on 04/07/2013

    Involvement:General (knows how to use it) - Ownership:more than 1 month


    Discharge cut off protection below 2.75v or 10A.


    Reset not automatic even when all voltages removed. I've found the best method is momentary short of the neg (battery) to neg (output) via a push button switch or springy tab solder to board.


    Can be used to protect series wired multi cell batteries as follows:

    Total protection: use 1 circuit on each cell. Any cell falling below 2.7v will stop discharge of the whole battery. Of course, lots of wires, switches, trouble to build and expensive.

    Reasonable protection: Use circuit to monitor 1 cell of a multi-cell, series connected battery. Check all cell voltages during 1 or 2 cycles. If this circuit is used on the weakest cell, then all cells will be protected. If you can't determine the weakest cell, then pick any one. The voltages of the un-monitored cells may drop below 2.7v, until the monitored cell reaches cut off, but it's not likely to be long enough to do severe damage.


    Li Ion cell can not be over discharged without suffering damage and shortened cycle life. This circuit offers inexpensive protection for both single cell and higher voltage multi-cell applications.

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