Exploring the Embedded Controller

I can’t read battery temperature despite running the latest version (fw-ectool-git-r2760.3ebe7b8-1).

$ sudo ectool temps all
--sensor name -------- temperature -------- ratio (fan_off and fan_max) --
local_f75303@4d       305 K (= 32 C)           0% (313 K and 343 K)
cpu_f75303@4d         306 K (= 33 C)           0% (319 K and 327 K)
ddr_f75303@4d         306 K (= 33 C)        N/A (fan_off=401 K, fan_max=401 K)
cpu@4c                307 K (= 34 C)           0% (376 K and 378 K)

$ sudo ectool battery
Battery 0 info:
  OEM name:               NVT
  Model number:           FRANGWAT01
  Chemistry   :           LION
  Serial number:          0035
  Design capacity:        3915 mAh
  Last full charge:       4047 mAh
  Design output voltage   15480 mV
  Cycle count             29
  Present voltage         16148 mV
  Present current         -285 mA
  Remaining capacity      2759 mAh
  Desired voltage         17800 mV
  Desired current         3915 mA
  Flags                   0x06 BATT_PRESENT DISCHARGING