19/06/2026
One of the biggest questions we get about NB-IoT deployments: "How does a battery-powered sensor last for years on a single charge?"
The answer lies in smart power state management.
Here's the breakdown:
- ACTIVE (10–100 mA) — Full power during data transmission. High performance when it matters.
- RRC-IDLE with eDRX (150–200 µA) — The device stays connected but wakes up only periodically to check for incoming data. Smart listening without burning power.
- PSM (Power Saving Mode) (1–10 µA) — Deep sleep. The modem powers down almost entirely, waking only when scheduled or triggered.
The key takeaway: it's not about always saving power — it's about using the right state at the right time. PSM extends battery life for long, infrequent reporting cycles. eDRX keeps devices responsive for smarter wake-ups when faster reachability is needed.
This is exactly the kind of power optimisation built into NORVI's NB-IoT modules — engineered for remote monitoring applications where battery replacement isn't practical for months or years at a time.
Learn More about NORVI MC-12 - https://norvi.io/products/battery-powered-data-logger/