Why battery-life claims vary
A GPS collar consumes energy when it wakes, finds a position, processes sensor data and transmits a message. The time spent in each stage changes with satellite visibility and radio coverage. A collar reporting once per day can operate much longer than the same hardware reporting every minute.
The main power drivers
| Factor | Effect on energy use | Planning response |
|---|---|---|
| GPS interval | More fixes require more receiver activity | Use the slowest interval that supports the decision |
| Transmission interval | Every radio session consumes power | Batch routine data where appropriate |
| Weak coverage | Retries and long connection time increase use | Improve gateways or select another network |
| Temperature | Extreme conditions reduce usable capacity | Test through expected seasons |
| Solar exposure | Can replace part of daily consumption | Account for shade, dirt and orientation |
Battery capacity is not runtime
A 20,000 mAh battery stores more energy than a smaller pack, but runtime still depends on device efficiency and operating profile. Ask the supplier for the voltage, test conditions and reporting schedule behind a claim. If different products use different voltages, mAh alone is not an exact energy comparison.
How solar assist changes the plan
Solar panels can extend service intervals when average harvested energy approaches average device consumption. Livestock movement changes panel orientation, and hair, mud or shade can reduce output. Design the system so a short period of poor charging does not immediately stop tracking.
Create a battery test profile
- Set the same GPS and upload interval intended for production.
- Enable the alerts and sensors the ranch will actually use.
- Place test collars on representative animals.
- Include strong and weak network areas.
- Record battery percentage, temperature, messages and solar conditions.
- Review the slope over several weeks rather than one day.
Maintenance strategy
Decide whether collars will be recharged, swapped or serviced in the field. Keep spare units and replacement straps. The platform should show low-battery status early enough to schedule handling without an emergency.
Questions for a supplier
- Which reporting interval was used for the battery estimate?
- Was the estimate measured with 4G, LoRaWAN or another network?
- How does poor signal affect the device?
- Can the battery or solar module be replaced?
- What low-battery alerts and historical battery data are available?