In this article we will guide you through the following sub-topics:

1. How to make sure your Envision Glasses are powered off?
2. How does the battery of your Envision Glasses operate? 
3. How to check if the battery performance is behaving as expected?
4. What are the next steps in case the battery of your Envision Glasses does not perform normally?

How to make sure your Envision Glasses are powered off?

To turn off your Envision Glasses, press and hold the button for 3 seconds. You will hear a sound when the Envision Glasses initiate the power-off process, which completes in 20 seconds.

We recommend shutting down Envision Glasses if you are not going to use them for the next three hours. If you are going to use them in the next three hours, we recommend that you simply put them in Sleep Mode. To learn more about this topic, please see Power Button

Envision Glasses will automatically turn on when you unfold them or when you plug them into a charger, even if you have already turned them off. We recommend that when you turn them off, you fold them up and put them in the protective case to ensure that the glasses will have battery power when you need them.

On the other hand, if you have any visual assistance, the power LED located at the end of the right arm next to the charging port, lights up when Envision Glasses are turned on and when they are charging. Therefore, a confirmation that the glasses are completely off is if the power LED is not blinking.

How does the battery of your Envision Glasses operate? 

Battery Life

• Envision consumes most of the battery when in use due to the need to have the camera active and light detection when using all features.
• Envision Glasses can be used for 4 to 6 hours per day in normal use conditions. Normal use means using a few Envision Glasses features once every hour or a couple of hours, not consecutively. If the glasses are used non-stop, the battery will drain faster.
• As batteries do not work in a linear fashion, some devices drain battery power easily from 100% to 80% and from 80% to 40% a little slower. If that happens with your Envision Glasses it is definitely normal behaviour.
• Even if the glasses are turned off or in Sleep Mode, it is normal for the battery to discharge, this behavior is similar to all electronic devices that use lithium batteries. The discharge will be more noticeable compared to other devices, as Envision Glasses hardware has a small module which, compared to the battery of a phone or other larger devices, will have a considerably shorter life.
• Lithium-ion batteries need to maintain a certain voltage to work properly. If the voltage drops, even if the battery still has charge left, the device may not be able to start until it receives enough charge to bring the voltage back up. This behaviour is often referred to as battery threshold lockout. This feature is designed to protect the battery and the device from damage and ensures safe and reliable operation.

Powering Envision Glasses after a long period of disuse

• If you haven't charged Envision Glasses for a couple of days/weeks, it may take longer to charge them. In this state, it's normal that Envision Glasses won't turn on when you press the Power Button. But don't worry. Grab a cup of coffee and return in a bit, and Envision Glasses should turn on normally. 

Take advantage of a fast charging adapter

• Inside the zippered pocket of the carrying case, you’ll find a power cable. This is a USB-A to USB-C cable, which allows you to charge your Envision Glasses by connecting it to any standard USB power adapter.
• The Envision Glasses support fast charging, and while the included cable is designed for standard charging, this setup works reliably with most USB power adapters. Charging times may vary depending on the adapter, and it’s completely normal when using the cable provided.
• If you’d like to charge your device more quickly, we recommend using a fast charging adapter along with a USB-C to USB-C cable that fully supports fast charging.

Recommended setup for fast charging

• A 30W or higher USB-C power adapter and USB-C to USB-C cable that supports power delivery or fast charge.
• When having charging problems, we recommend to please check the power outlets, the USB-C charging cable and the power adapter.
  
  Disclaimer: Connecting the Envision Glasses to a computer using the included cable will usually not charge the device. As well, the device will not be detected by most desktop or laptop computers.

Be prepared when leaving home

If you’re planning to spend a lot of time away from home, having a power bank can make a big difference—especially if you’re using your phone as a personal hotspot while wearing your Envision Glasses. Below are two power bank options to help you stay charged throughout the day:

High-Capacity Power Bank:

• Ideal for: Long days out, travel, or situations where you may not have regular access to a wall charger.
• Why it’s helpful: It can recharge your Envision Glasses multiple times, along with your phone or other devices, and is ideal for users who rely on personal hotspots or need extended use throughout the day.
• What to look for: A capacity of at least 20,000mAh, a USB-C port that supports power output, not just input and output specs of at least 1.5A at 5V for compatibility with fast charging.

Compact Power Bank:

• Ideal for: Short outings, quick top-ups during the day, or as a lightweight backup power source.
• Why it’s helpful: The Envision Glasses have a relatively small battery, so even a low-capacity power bank can recharge them once or twice, and it’s compact enough to carry in your pocket or glasses case.
• What to look for: A capacity of around 5,000mAh and a USB-C output port with at least 1.5A at 5V.

Charging Tip

Ensure that the power bank’s USB-C port supports output charging. Some compact power banks may have USB-C ports intended only for charging the power bank itself. While the included USB-A to USB-C cable works well for standard charging, using a USB-C to USB-C cable that supports fast charging, in combination with a compatible power bank, can provide quicker charging times for your Envision Glasses.

Having the right power bank and cable setup means more confidence and fewer interruptions when you’re on the go. Whether you choose a compact or high-capacity option, ensure compatibility with USB-C output and fast charge standards for the best experience.

How to check if the battery performance is behaving as expected?

Based on the above information, rest assured that the battery of your Envision Glasses is performing as expected, if: 

1. Your Envision Glasses can be used for 4 to 6 hours per day in normal use conditions. Normal use means using a few Envision Glasses features once every hour or a couple of hours, not consecutively. If the glasses are used non-stop, the battery will drain faster.
2. Compared to the battery of a phone or other larger devices, they will have a considerably shorter battery life.
3. The battery will discharge even if your Envision Glasses are turned off or in Sleep Mode, this behavior is similar to all electronic devices that use lithium batteries. The discharge will be more noticeable compared to other devices, as the Envision Glasses hardware has a small module that, compared to the battery of a phone or other larger devices, will have a considerably shorter lifetime.
4. If you haven't charged Envision Glasses for a couple of days/weeks, it may take longer to charge them.

What are the next steps in case the battery of your Envision Glasses does not perform normally?

A case in which the battery may require replacement would be a discharge from 100% to 0% in less than 10 hours without active use or if you detect an abnormal behavior of the battery that is not mentioned above as normal behavior.

In this case, please inform us directly at support@letsenvision.com, as we would need to perform a final examination of your Envision Glasses, which will require the device to be shipped to our offices in order for us to perform the appropriate tests and deliberate whether it is a hardware issue that requires replacement or is related to other factors.

This examination is performed by our Glasses Engineering and Design Teams, once your unit is received.