comparing autel bt506 to topdon bt100 battery testers 

I've used both in my shop, Topdon is way more superior plus no need for usb charging. Topdon is always ready for checking systems

The most important test result is the internal battery resistance which is non existent with the autel battery tester. You can literally perform all the other tests manually using a digital multimeter and perform even further testing to include currents using a digital clamp meter. For that price you're better off getting the topdon bt600 or foxwell bt706.

There’s a big difference in the battery test results. It could be because you have both connected at the same time but I have no idea if it’s the method or device(s).

Animal