Star Xu:
measured temp = 25C, you need to convert it to Kelvin by adding 273.15 then multiplying by 10 to get approx. 2982, bq27426 gauge uses 0.1 Kelvin as a unit for temperature measurement , then convert it to HEX (2982 = 0x0BA6), use the Temperature() command to write this value to the gauge to be used in gauging calculation by using Advance Comm tab:
I2C Address (Hex) = aa
Start Register (Hex) = 02
Bytes to Write (Hex) = A6 0B