A BLE Tag is only as good as the battery that powers it. This article explains how a BLE Tag achieves long field life through power-aware design—balancing advertising, connection, and sleep to stretch every milliampere-hour.
Power breakdown
A BLE Tag spends energy in three states: advertising, connected, and sleep. Sleep dominates the calendar; the active bursts decide the average draw.
Advertising interval versus battery
A BLE Tag broadcasting every 100 ms drains fast; at 1 s it lasts far longer. Interval is the single biggest lever on runtime.
Connection versus broadcast
A BLE Tag that stays connected burns more than one that advertises and sleeps, because the link must keep a live heartbeat.
Battery selection
A BLE Tag commonly uses a CR2032 coin cell; capacity and pulse-current rating both matter, since a weak cell sags under a transmit burst.
Low-power modes
A BLE Tag uses deep sleep between events and wakes on a timer or GPIO, so most of its life is spent near zero current.
Runtime model
Estimate a BLE Tag‘s life from average current: life = capacity ÷ average draw. Small cuts in draw multiply into months of extra runtime.
Temperature effect
A BLE Tag in a cold store sees reduced usable capacity, so design for the worst-case environment, not the lab.
Extending life
A BLE Tag lasts longer with longer intervals, lower transmit power, fewer connections, and event-driven rather than continuous reporting.
Real-world numbers
A typical BLE Tag at a 1 s interval reaches one to two years on a coin cell; stretching the interval pushes that further.
Conclusion
Power optimization lets a BLE Tag run for years unattended. By shaping the advertising, connection, and sleep profile, you turn a tiny battery into a multi-year field life.