Our Battery Tester BT3915 is default to test battery internal resistance to measure the health status, if you prefer to test battery internal conductance, it can also switch the test mode to test conductance
1. Click “System”
2. Click “Version”
3. After you see this information, long press⬅️(3 seconds), then long press➡️（3 seconds)
4. Password 95769576
5. Change Model to 3918, then “save” and reboot the unit