It's not just bluetooth speakers, but any electronic device left charging for too long can suffer from 'battery fatigue,' compromising safety. So how do you know when a bluetooth speaker is fully charged? Let's explore that in this article from Mytour superstore.
How to Tell When Your Bluetooth Speaker is Fully Charged?
Every bluetooth speaker comes equipped with small LED lights. These LEDs serve to notify users when the speaker is running low on battery, charging, or fully charged. Typically, when the battery is low, they'll blink or turn red, remain lit when charging, and turn off when fully charged.
However, the indicators differ between brands. Below are the signs indicating a fully charged bluetooth speaker from top brands today:
SONY Bluetooth Speakers

The charging port location and battery level indicator lights on various models of SONY bluetooth speakers.
Low Battery:
- The CHG (Charge) light flashing slowly indicates low integrated battery capacity and requires charging.
- Flashing three times then turning off when you turn on the speaker means the integrated battery is depleted and needs charging.
Charging in progress: The light is on.
Battery fully charged: The light is off.
Note: SONY also integrates additional features to detect abnormalities in the integrated battery to ensure user safety. If you notice the CHG light flashing rapidly, you should immediately stop charging.
BOSE Bluetooth Speakers and JBL Bluetooth Speakers
Running low on battery: To visually check the battery level of the speaker, press and hold the power button while viewing the battery indicators:

The power button of some BOSE Bluetooth speakers (pictured) is located on the top and left side of the speaker.

Battery level indicator of JBL bluetooth speaker.
• ○○○○ | 0% - 20% |
•• ○○○ | 20% - 40% |
••• ○○ | 40% - 60% |
•••• ○ | 60% - 80% |
••••• | 80% - 100% |
Charging: The last indicator light flashes white.
Battery Full: All 5 battery indicators will illuminate white.
HARMAN KARDON Bluetooth Speaker

The low battery indicator of HARMAN KARDON bluetooth speakers may be located underneath or it could be the power button itself.
Battery Low: Rapidly blinks twice to warn of weak battery (<15%).
Charging: Power button will blink.
Battery Full: Power button stops blinking.
Tips for Charging Bluetooth Speakers
In addition to 'how to determine when a bluetooth speaker is fully charged?', to ensure safety during usage, you also need to know how to charge bluetooth speakers correctly. Here are some mistakes to avoid when charging the battery for bluetooth speakers:
Overnight Charging
Many electronics manufacturers have equipped their products with chips tasked with managing power at nearly 100% capacity, automatically cutting off charging when the battery reaches its peak. However, not all electronic companies achieve this. Moreover, frequent overnight charging can lead to battery degradation and damage due to increased temperatures. According to SONY's recommendation, you should only charge the speaker when both the device and the surrounding environment are not too hot or too cold, i.e., at temperatures between 5°C - 35°C (41°F - 95°F).
Charging while Listening to Music
When you use the speaker at high volumes for extended periods, the battery may drain even when the speaker is connected to a power source. As a result, the sound becomes low and unpleasant. Therefore, it's advisable to turn off the speaker and wait until the battery is fully charged again.

To expedite the charging process, it's advisable to turn off the product.
Avoid Charging when Not in Use
This is a common mistake many people make when using Bluetooth speakers. Even when not in use (turned on), the battery of the Bluetooth speaker can still drain due to storage capacity, software updates, etc. Even if you don't intend to use the speaker for an extended period, charge the battery to full capacity once every 6 months to maintain the speaker's functionality.
Use the Speaker until Power Off
Similar to overnight charging, using the speaker until it powers off is also not good for the battery. Ideally, you should charge it when the device indicates 20% remaining battery, rather than waiting for it to drop lower. Additionally, you don't necessarily have to wait for the battery to be almost empty before charging. In fact, you can charge it anytime, even when the speaker still has 60% battery remaining.
Properly charging the battery is crucial to ensuring the longevity and safety of electronic devices in general. If you're still unsure about how to determine when a specific Bluetooth speaker is fully charged, you can visit Mytour's supermarket system for thorough guidance or click HERE to explore the latest Bluetooth speaker models available today at extremely attractive prices.