[Android Q&A, Help & Troubleshooting] danergo:
Consider an Android (5.1.1) phone with battery removed and powered by external power. The external power replaces the battery, so the phone thinks it still has its original battery.

This works fine 100%, but I have an issue. The phone can get direct sunshine and on hot summer days it usually shuts down due to thermal alarm of battery.

Here is the Logcat:

[ 07-26 11:59:16.191 521: 1067 I/system_monitor ]

alarm_callback - Received MAX alarm: batt_therm at Level:1

[ 07-26 11:59:16.195 968: 6013 I/libsysmon ]

handle_notification - Called

[ 07-26 11:59:16.195 968: 6013 I/libsysmon ]

handle_notification - Dumping notification

[ 07-26 11:59:16.195 968: 6013 I/libsysmon ]

name: batt_therm

[ 07-26 11:59:16.195 968: 6013 I/libsysmon ]

current_level: 0

[ 07-26 11:59:16.195 968: 6013 I/libsysmon ]

prev_level: 1

[ 07-26 11:59:16.195 968: 6013 I/libsysmon ]

shutdown_in: 20

[ 07-26 11:59:16.195 968: 6013 I/libsysmon ]

Adding action: SHUTDOWN

[ 07-26 11:59:16.195 968: 6013 I/libsysmon ]

handle_notification - Going to callback function

[ 07-26 11:59:16.196 968: 6013 I/libsysmon ]

[ 07-26 11:59:16.196 968: 6013 I/libsysmon ]

[ 07-26 11:59:16.276 521: 1067 E/system_monitor ]

write_miscta_sysmon_log - read error[10022].

[ 07-26 11:59:16.284 186: 186 I/tad ]

MiscTA Unit 10022:

[ 07-26 11:59:16.284 186: 186 I/tad ]

NOT WRITTEN (Identical)

[ 07-26 11:59:16.284 186: 186 I/tad ]

MiscTA: Write of unit 10022 completed - OK

[ 07-26 11:59:16.311 186: 186 I/tad ]

MiscTA Unit 10025:

[ 07-26 11:59:16.312 186: 186 I/tad ]

WRITTEN (Size 50)

[ 07-26 11:59:16.409 186: 186 I/tad ]

Actual erase/write to flash done (count 1, time 1564135156).

[ 07-26 11:59:16.409 186: 186 I/tad ]

MiscTA: Write of unit 10025 completed - OK

[ 07-26 11:59:16.431 186: 186 I/tad ]

MiscTA Unit 10024:

[ 07-26 11:59:16.431 186: 186 I/tad ]

WRITTEN (Size 50)

[ 07-26 11:59:16.494 186: 186 I/tad ]

Actual erase/write to flash done (count 2, time 1564135156).

[ 07-26 11:59:16.494 186: 186 I/tad ]

MiscTA: Write of unit 10024 completed - OK

[ 07-26 11:59:16.501 186: 186 I/tad ]

MiscTA Unit 10023:

[ 07-26 11:59:16.501 186: 186 I/tad ]

WRITTEN (Size 50)

[ 07-26 11:59:16.574 186: 186 I/tad ]

Actual erase/write to flash done (count 3, time 1564135156).

[ 07-26 11:59:16.574 186: 186 I/tad ]

MiscTA: Write of unit 10023 completed - OK

[ 07-26 11:59:16.576 521: 1067 I/system_monitor ]

Shutting down

[ 07-26 11:59:16.996 1930: 1930 I/GPSManager ]

location.getAccuracy() 4.0

[ 07-26 11:59:16.996 1930: 1930 I/AdressUpdate ]

AdressUpdate

[ 07-26 11:59:18.009 1930: 1930 I/GPSManager ]

location.getAccuracy() 4.0

[ 07-26 11:59:18.009 1930: 1930 I/AdressUpdate ]

AdressUpdate

[ 07-26 11:59:18.221 2217: 2231 I/art ]

Background sticky concurrent mark sweep GC freed 64885(3MB) AllocSpace objects, 0(0B) LOS objects, 10% free, 27MB/30MB, paused 9.626ms total 105.405ms

[ 07-26 11:59:18.336 968: 1034 W/PackageManager ]

Invalid verification token 0 received

[ 07-26 11:59:18.993 1930: 1930 I/GPSManager ]

location.getAccuracy() 4.0

[ 07-26 11:59:18.993 1930: 1930 I/AdressUpdate ]

AdressUpdate

[ 07-26 11:59:19.984 1930: 1930 I/GPSManager ]

location.getAccuracy() 4.0

[ 07-26 11:59:19.984 1930: 1930 I/AdressUpdate ]

AdressUpdate

[ 07-26 11:59:20.983 1930: 1930 I/GPSManager ]

location.getAccuracy() 4.0

[ 07-26 11:59:20.983 1930: 1930 I/AdressUpdate ]

AdressUpdate

[ 07-26 11:59:21.666 968: 1572 W/InputMethodManagerService ]

Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@1cafeb50 attribute=null, token = android.os.BinderProxy@224ee282

[ 07-26 11:59:21.727 968: 1028 I/MediaFocusControl ]

AudioFocus requestAudioFocus() from android.media.AudioManager@2079c149 req=1flags=0x0

[ 07-26 11:59:22.064 968: 5233 W/ShutdownThread ]

Disabling Bluetooth...

[ 07-26 11:59:22.069 968: 5232 I/ShutdownThread ]

Sending shutdown broadcast...

[ 07-26 11:59:22.078 968: 5232 I/ShutdownThread ]

Shutting down activity manager...

[ 07-26 11:59:22.084 968: 968 W/SyncManager ]

Writing sync state before shutdown...

[ 07-26 11:59:22.097 1930: 1930 I/GPSManager ]

location.getAccuracy() 5.0

[ 07-26 11:59:22.097 1930: 1930 I/AdressUpdate ]

AdressUpdate

[ 07-26 11:59:22.240 4674: 4750 I/BluetoothAdapterState ]

Bluetooth adapter state changed: 12-> 13

[ 07-26 11:59:22.274 968: 5233 W/ShutdownThread ]

Turning off cellular radios...

[

Now, of course high temperature is wrong for battery, but this particular case the phone has no battery at all.

(How) is it possible to increase the battery thermal alarm value? Based on my measurements it seems firing around 65 °C. I would raise it a bit, to 75 or maybe 85 °C, but not more.