Shunda TEC-06 Battery Tester

Operation:

• current used in AH.  Press to start Mode 1 testing.
• battery voltage. No testing, current voltage.  Mode 1: open circuit voltage (no load). Mode 2: voltage under load.  Press to start Mode 2 testing.
• final voltage.  Testing stops at this voltage.
• discharge current in mA.  50-3500.
• internal resistan in Ω. Reported in Mode 1 with 4-wire harness.

Best reference:

• https://syonyk.blogspot.com/2018/01/tec-06-serial-battery-tester-review.html

Reverse engineered serial protocol:

• https://github.com/Syonyk/TEC06
• https://syonyk.blogspot.com/2018/01/tec-06-serial-battery-tester-review.html