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18650 Li-Ion cell discharger circuit and Arduino software.

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Battery Capacity Checker

Discharge 2 Li-Ion cells from >4.1V voltage to 2.5V while recording the discharge profile and cell capacity. Discharge process can be started by pressing a momentary push button switch. A red LED lights up to indicate that the discharge process is still continuing (2.5V cut off has not been reached).

Circuit:

Schema:

li ion cell discharger schem

Main components:

  • 2x 50A, 50V, 0.022 Ohm, Logic Level, N-Channel Power MOSFET: F50N05L

  • power resistors: 2x Ceramic 1 Ohm, 10 Watt (shunt); 2x Aluminium 3.3 Ohm, 25 Watt (load)

Note
Many other N-Channel MOSFET’s can be used.

Breadboard:

Example Result

1500mAh cell:

y-axis blue: cell voltage
y-axis red: cell capacity
x-axis: time in seconds

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