XH-M240 18650 lithium battery Capacity tester maH mwH digital discharge electronic load battery monitor - AliExpress
Wal front LED Digital Display Battery Capacity Meter, 1.2-12V 18650 Li-ion -Acid Discharge Tester Module Board Analyzer: Amazon.com: Electronics
18650 Li-ion Battery Capacity Tester Module LCD Display USB Type-C Port 5V 1A | eBay
Lithium Battery Capacity Tester XH M239 Li Ion Battery 18650 High Accuracy Capacity Tester Module Mah and Mwh Digital Display Measurement for 18650 XH M239: Amazon.com: Electronics
Battery Capacity Tester mAh mWh for 18650 Lithium Battery