IR502 battery internal resistance tester. It's more useful than you think.

www.aliexpress.com/item/10050...
- Wider measurement range: ±120V battery voltage, 500Ω battery internal resistance measurement and can test more types of batteries, including lead-acid batteries, lithium batteries, nickel-cadmium batteries, alkaline batteries, etc.
- 6 Resistance Range Automatic Switching function ,automatically adapt to the resistance range of different batteries
- 3.2 clear large color screen and powered by 1200mAH lithium battery
Specifications:
Voltage：0.00V~±120V
Internal Resistance Measurement：0.000mΩ~500Ω
Maximum Input Voltage：DC120V (non polarized), cannot input AC
Measuring Current：50mA~50uA AC
Measurement Speed：3 times/second
Measure Signal Frequency：1KHz
Voltage Range Selection: Automatic/manual selection
Selection Of Internal Resistance Range: Automatic/manual selection
Autonomous Connection Optional： √
Measuring Method: 4 line Kelvin testing method
User Self Calibration： √
Autonomous Factory Recovery： √
Battery Selection Criteria: Lead acid batteries, lithium batteries, nickel cadmium batteries, alkaline batteries, etc
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[@guateque1718]

Great video, thank you. This tooltop has been added to my list.

[@nandeepkhajuria2326]

Wow, Thanks for these knowledgeable videos - I really help me to discover new things in the world of electronics

[@alfasoft9670]

Hello, how can I contact you? I have an order for a project, I emailed you several times, but I did not receive a reply

[@chyasim1723]

Excellent 👌plz share gerbar file