Bluetooth and battery life

Tested: How much does Bluetooth actually drain your phone battery?

Does Bluetooth drain your battery? All wireless technologies need power, but how much is a topic riddled with anecdotes and theories? Despite advancements in Bluetooth technology, it’s still a pretty common belief that you’ll get much more life out of your phone by turning off Bluetooth, Wi-Fi, NFC, and various other features when you’re not using them.

I find these old habits hard to break. Yes, I still turn Wi-Fi off when leaving the house and disable Bluetooth until I listen to music. But is that necessary in the modern age of “smart” technology? How much battery do I waste if I leave Bluetooth on while not using it? What about playing music over Bluetooth? Is the battery drain higher than using speakers or wired headphones? To find the answers to these questions, we grabbed a handful of phones and ran some tests.

Editor’s note: This article was originally published in 2020 but the favorable results continue to hold true with modern smartphones. Moreover, the latest Bluetooth Low Energy standard promises improved audio streaming quality even at lower power levels.

How we tested

To grasp exactly how using Bluetooth impacts battery life, we picked up five different smartphones from 2020. We have the Samsung Galaxy S20 Plus, HUAWEI P40 Pro, ZTE Axon 11, Xiaomi POCO F2 Pro, and realme X3 Superzoom in this test. We ran them through two unique scenarios and monitored the results with our in-house testing software.

The first is a typical daily battery drain scenario designed to determine if turning off Bluetooth actually saves battery. To do this, we performed two sets of tests. The first was done with Bluetooth off and the second with Bluetooth on but idle — i.e., not connected to anything — and then we compared the results. The test itself consists of three cycles — the first features 90 minutes of web browsing followed by 90 minutes of sleep and then 90 more minutes of browsing. Then the phones sleep for 16 hours in the second cycle to give us a good look at idle power draw. The third cycle repeats the first cycle.

Our second set of tests simulates a more demanding Bluetooth-specific use case and should determine how much Bluetooth impacts battery life when you’re actively using it. To simulate this, we monitored video playback for 4 hours straight, as you might do on a long flight. This series consists of a control test with Bluetooth off, Bluetooth on but no connection, and finally, the video audio over Bluetooth using the basic SBC audio codec.

We locked each display brightness to 200 nits to keep the tests fair. Mobile data, NFC, and anything else was also disabled on each handset for all these tests. Except for leaving Wi-Fi on in the first scenario so we can web surf.

We also took averages of the results to give us a better overall look at Bluetooth battery drain. All of the graphs in this article are based on an average based on testing across the five devices mentioned above.

So… does turning Bluetooth off save battery?

Over the course of our 26-hour “typical day” test, leaving Bluetooth on consumed just 1.8% more battery compared to the test with Bluetooth off. On average, our devices consumed 49.4% of their battery during this test with Bluetooth off versus 51.2% with it left on. Extrapolating this to a complete charge cycle, Bluetooth consumes less than 4% extra battery life. So, leaving it off might add 10 to 15 minutes of extra time for a device that typically gives five hours of screen-on time. Peanuts really.

There was a slight difference between the devices we tested. The HUAWEI P40 Pro and POCO F2 Pro saw the most significant difference with Bluetooth on and off — a 3% difference. Meanwhile, the Samsung Galaxy S20 and realme Superzoom recorded slightly less power drain with Bluetooth on. This is likely down to a margin of error, highlighting just how little impact Bluetooth actually has on battery life.

For a more detailed breakdown, check out the graph below:

What’s noticeable here is that idle battery drain is essentially the same over a 16-hour sleep period. We can chalk the 0.2% difference up to a margin of error — regardless of whether Bluetooth is on or off. Meanwhile, on average, our devices showed a relatively consistent 1% difference in battery drain during our four-hour, 30-minute use cycle. Again, this is so small it makes practically no difference to battery life.

This highlights that modern smartphones put Bluetooth radios to sleep when not in use. They’re only awake and periodically scanning for pairable devices while your smartphone is awake. So, you really don’t need to worry about turning Bluetooth off before you go to bed.

How much battery does Bluetooth use?

So, Bluetooth doesn’t really impact the battery when left on but not in use. What about when you’re actively using Bluetooth on your phone? Well, our four-hour video playback test showcases a similar battery drain difference across all five devices.

The comparison between Bluetooth off and on but not connected reveals an average of just 1.6% more battery drain over four hours. That’s still very small but indicates more power drain than our earlier test. Likely because our devices are in constant use for a prolonged period of time, and Bluetooth radios spend less time asleep.

Extrapolated to a full charge cycle, watching video while leaving Bluetooth on but not connected increased power consumption by about 6.6% on average. That’s still pretty small, but not nothing. However, this constant video playback scenario is improbable in the real world.

Interestingly, there’s quite a lot of variation between different smartphones. The Samsung Galaxy S20 Plus recorded the same result with Bluetooth on and off. Meanwhile, the realme X3 Superzoom is the worst affected, clocking in an extra 4% battery drain over four hours.

The reason for this discrepancy is likely down to smartphone hardware and software optimizations. The Galaxy S20 Plus’ Exynos and HUAWEI P40 Pro’s Kirin chips will use different radios to the other phones’ Snapdragon SoCs. Similarly, each Android software variant likely has various algorithms for Bluetooth wake-up and pairing scan intervals. No two devices will see the same amounts of battery drain, but results vary from zero to negligible in any case.

Does using Bluetooth headphones drain battery?

This is an excellent question and why we conducted these second tests with audio playback as the baseline use case. After all, it’s what most people use Bluetooth for these days.

The results show that playing back audio over Bluetooth consumes essentially the same amount of power as playing back audio over speakers or headphones with Bluetooth turned off. On average, our devices recorded just a 0.2% increase in power consumption when playing back audio over Bluetooth. So, well into the margin of error territory. The Galaxy S20 Plus and POCO F2 Pro recorded no noticeable difference in battery drain over a four-hour listening period.

This is because Bluetooth audio encoding algorithms run efficiently on digital signal processors (DSP) found inside modern smartphones — consuming very little power. At the same time, audio amplifier circuits switch off when playing back audio over Bluetooth. This balances out the power drawn from the Bluetooth wireless chip. The louder you listen, the greater the savings become.

What we’ve learned

Our test is only so accurate and doesn’t consider every possible Bluetooth use case. That said, it gives us a good look at how Bluetooth affects battery life from a big-picture perspective. There are small variations in battery drain between smartphone idle and screen-on scenarios, but we’re only talking mere minutes of difference between on and off.

Importantly, Bluetooth doesn’t appear to affect battery life when phones are idle. So, it’s not going to run down your battery during long periods of inactivity or if accidentally left on overnight.

Most users won’t see any noticeable amount of extra smartphone battery drain if they forget to turn Bluetooth off. Turning it off is still a good idea to avoid connecting to unwanted devices, and if you’re super concerned about security.

But to answer our title question, Bluetooth drains very little of your smartphone’s battery. You really don’t need to worry.

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How Long Do Bluetooth Speakers Last – Lifespan And Battery Life Explained

Bluetooth speakers have revolutionized the way that we listen to music and other forms of audio. Their wireless design, mobility, and simple operation make them useful in a variety of settings.

How long do Bluetooth speakers last?

Bluetooth speakers should last for many years before their battery life decreases significantly. This depends on some key variables, including how often the speaker is used, how it is stored, and also how durably it is constructed.

All batteries within electronic devices have a lifespan, which is impacted by how heavily the item is used, how often it is charged, and other factors such as the temperature that it is commonly stored.

High-end Bluetooth speakers contain good quality, strong batteries which are designed to work to the best of their abilities for years. Other speakers may use batteries that perhaps aren’t as reliable.

In this guide, we’ll explore the lifespan and battery life of Bluetooth speakers in detail.

Bluetooth Speaker Battery Life

The battery life of a Bluetooth speaker varies depending on the particular model in question, and its manufacturer. On average, you can expect a speaker to work for between ten and twenty hours on a full charge.

Smaller Bluetooth speakers may be limited to a couple of hours of usage on a full charge. It depends on the quality and size of the battery, and of course the competence of the company behind the speaker.

I personally choose the beautiful Marshall Bluetooth speaker pictured above. As well as having excellent battery life and build quality it looks amazing and the sound quality is truly mind-blowing.

JBL, one of the most popular manufacturers of Bluetooth speakers, often equip their devices with the capacity to run for 20 hours constantly when fully charged. Their reliable Charge 4 Bluetooth speaker is an example of this.

Check out the Charge 4 JBL Bluetooth speaker here on Amazon.

This speaker includes a 7800mAH Li-ion battery, which is powerful enough not only to play audio for 20 hours straight but also to charge your phone, tablet, or another source device via its onboard USB port.

Comparatively, Bluetooth speakers that are more compact and designed for portability are likely to offer a reduced battery life. This is simply down to the housing not being large enough to store a large battery as the aforementioned JBL speaker can.

This is illustrated by the Bose SoundLink Micro, a small speaker which provides up to 6 hours of playtime on a full charge. That’s 14 hours less than the maximum battery life of larger devices, but it won’t take nearly as long to fully charge.

Take a look at this excellent video review on the Marshall Bluetooth Speaker

Hi, I’m Chris. I have an all-around love of anything musical and have been associated with various bands from a very young age. My passion here at stampsound.com is to provide helpful straight forward clear advice and tutorials for aspiring and established musicians.

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