XH-M240 Battery Capacity Tester – 18650 Lithium Discharge Energy Meter, 5V-12V Input, 500mA Discharge, 8Ω Load, LED Display, Circuit Board

This XH-M240 battery capacity tester is a handy little gadget if you work with 18650 lithium batteries or other rechargeable cells.
It measures discharge capacity (in mAh) and discharge energy, and it's accurate down to 1mAh with a display resolution of 0.

1 – plenty precise for most hobbyist and DIY needs.
It runs on DC power from 5V to 12V, or you can even power it directly from the 18650 battery you're testing (though the battery isn't included).
The discharge current is about 500mA through a 10W, 8Ω load resistor.

The board itself measures about 4.
33 x 3.

15 inches (11 x 8cm) and has 3mm mounting holes, making it easy to install in a project box or test rig.

Standby current is only 5-7mA, so it doesn't waste power.
It even has a memory function that saves the last reading, so you can check results later without having to re-run the test.

This tester is perfect for checking the health of old batteries, matching cells for packs, or verifying claimed capacities from sellers.

It's made from quality circuit board components with good conductivity and long service life.
The green PCB is standard and durable.

Just connect your battery, set it up, and let it run – the display shows you real-time voltage, capacity, and energy numbers.
It's a simple but effective tool for anyone into flashlights, vapes, power banks, or any device that uses 18650s.

A great value for the price, and way cheaper than buying a commercial battery analyzer.
If you're into electronics or battery-powered projects, this tester is a no-brainer.