Mark-World - Tech Projects To Amuse The Curious
Battery Load Tester
This is a device I had wanted for a great many years and got around to making one.
The Battery Load Tester has two connections to hook up a battery of your choice to be tested and then a load is connected to model your needs for the load you want to test.
In this case a LiIon 81650 high current battery is tested with a 10 ohm resistor.
The tester automatically stops a load test at the knob defined cutoff voltage (Cov). Stopping the test prevents bringing the battery below its lowest safe discharge level which can and will damage a battery. Before this tester I had forgot tests and degraded batteries. NO MORE!
Several common small battery connectors or connector for a cell phone charging battery are attached in this picture.
Due to very large currents when I test 12amps and up to 24V this tester has large copper screw terminal connectors. Not required here but does come in handy to attach most any battery.