August 12, 2021
Most Bluetooth beacons are powered by the lithium-ion ER14250 battery. How long can this tiny battery keep bluetooth messages going? Do you need to replace the battery frequently? The Createk low power Bluetooth beacon, powered by two ER14250 batteries, can be used for up to 5 years. The battery life of Bluetooth beacon is related to several factors such as bluetooth beacon broadcast interval, transmitting power, DC/DC and LDO power supply, whether it can be connected, whether an external clock is used, the size of the launch Payload, and battery self-discharge.
1. Influence of broadcast interval on power consumption:
All other things being equal, the broadcast interval is adjusted from 500ms to 100ms, and the average current is increased from 28μA to 126μA.
2. Influence of transmission power on power consumption:
All other things being equal, the transmission power is adjusted from 0dBm to 4dBm and the average current is increased from 28μA to 36μA.
3. Differences between DC/DC and LDO:
Other things being equal, the average current is 28μA when LDO is used, and 18μA when DC/DC is used.
4. Influence of connection on power consumption:
All other things being equal, the average current in unreachable mode is 28μA; Average current increased to 37μA in connectable mode.
5. Influence of TX Payload (Byte) on power consumption:
If other conditions remain unchanged, the average current is 28μA when the Payload is 16 bytes. When the Payload was 31 bytes, the average current was 36μA.
6. Impact of external clock on power consumption:
The average working current of external clock is 27μA when other conditions remain unchanged. Using internal RC clock, the average operating current is 28μA.
7, the impact of battery self-discharge on the service life:
1) Advantages of ER14250:
The operating voltage of ER14250 is stable and safe. The operating voltage is usually between 3.3 and 3.6V. The specific energy is as high as 620Wh /kg, which is the highest in all kinds of chemical batteries. Long storage life; The annual self-discharge rate at 25℃ is less than 1%. Long service life; Can adapt to a wide range of temperature, generally in -55~+85℃; Good seal, no leakage.
2) Self-discharge condition of ER14250:
At the temperature of 23±2℃, the annual self-discharge rate is less than 1%. High temperature affects the battery self-discharge rate. The self-discharge rate increases by 1% for every 10 ° C increase. If you want to calculate carefully, also combined with the application of the city weather temperature, above 30 degrees Celsius statistics about the weather, if it is used in outdoor scenes, but also to the sun to metope, produced by the earth's surface temperature, the general situation is when the temperature at the time of 30 degrees Celsius, the earth's surface or metope, temperature on the surface of the object according to 1.5 or 2 times the value of the reference. If the temperature is 30 degrees and the wall temperature is 1.5 times, then the calculated temperature is 45 degrees. If the temperature exceeds 25 degrees and 20 degrees, the self-discharge rate is 2% higher than that at room temperature, so the self-discharge rate is calculated as 3%.
