Reply To: Pi Zero + SIM7600 trailer tracker drains a 10 Ah power bank in nine hours

Aoife, the Pi has no deep sleep, sadly. It’s a Linux box, it’s either running or off. So you cut everything you can and make the radio work less.

What I’d do, in order of payoff:

1. Pi: dtoverlay=disable-wifi and dtoverlay=disable-bt in config.txt, HDMI off (tvservice -o on older images), activity LED off. On a Zero that gets you to roughly 80 mA.
2. GPS: switch the GNSS engine off between fixes (AT+CGPS=0, then AT+CGPS=1 again). A warm start on the SIM7600 is a few seconds.
3. Rate: 30 s while moving, 15 to 60 min while parked. Use speed or the distance from the last fix to decide.
4. Batch: buffer fixes and send one message every few minutes as an array with ts. GPS gives you a correct clock, so the timestamps are trustworthy. One HTTPS call instead of ten is less radio time, and it costs one message out of the monthly quota instead of ten.

[{"ts": 1757683200000, "values": {"lat": 52.95231, "lon": -1.14972, "speed_kmh": 31.5}},
 {"ts": 1757683230000, "values": {"lat": 52.95410, "lon": -1.14701, "speed_kmh": 33.0}}]

Because the device only talks every few minutes, set its profile’s online rule to Recent message with an expected interval that matches your parked rate, otherwise it shows offline all night.

If a week is a hard requirement, the honest answer is a microcontroller (ESP32 or nRF) that sleeps and wakes the modem, or a timer chip like a TPL5110 that cuts power to the whole Pi between runs. A Linux board idling at 80 mA will never get there on 10 Ah.