Simple Battery Testing Jig

Simple Battery Testing Jig for AAA, AA and 18650 battery. Helps with measuring many batteries in a row.

Help to measure the batteries together with a multi-meter. It is not a full system, you need a multi-meter. 

I striped some wires and turned them around the poll. I attached one end to one of the two terminal and the other to a switch and resistors combo. I solder a little on each test point just to make it a bit more resistant to wear and tear.

Used together with a switch and a 10 Ohm resistor to be able to see the battery voltage while the battery is under a load. When the battery is new it will measure around 1.5V with no load and it might drop a little when the switch is turned one. 

The switch is connected in series with the resistor, and they are connected in parallel with the battery. A nominal values the current will be around 150mA. The voltage might be high at low or no loads so its important to test the battery under load to see its true potential. I usually think it used up if it is under 1.2 V under load. Here is a graph for those whole like it a bit more accurate: https://forum.arduino.cc/t/calculate-battery-percentage-of-alkaline-batteries-using-the-voltage/669958