Keep in mind this will limit the charging rate to 7.5 watts. Switching to a newer battery pack is the recommended way to solve this issue, but alternatively you can try switching to a USB-A to USB-C cable. If HoloLens 2 charges an external battery rather than being charged by it, this indicates that the battery doesn't implement TRY.SRC. Troubleshooting HoloLens Charges External Battery Note that this option won't provide as much operating time since the internal battery will still slowly deplete. Are you using the correct batteries Only connect rechargeable batteries to the charger. If heat is still an issue after following steps above, consider using a charger or battery pack that limits charging to 1.5A. The indicator light on my battery charger doesnt light up.When an external battery is depleted, HoloLens will continue operating on its internal battery.It's OK to connect HoloLens 2 to an external power source even when the internal battery is fully charged.Customers who need to operate HoloLens for extended periods of time in hot environments can use the following techniques: Also, starting a charge at a lower battery level will generate more heat than starting a charge when the battery is mostly full. The more rapid the charge, the more heat is generated. Managing HeatĪs with any device, charging HoloLens generates heat. It's important that these battery packs implement TRY.SRC to ensure they charge HoloLens rather than charge from it. However, note that some USB-C battery packs recharge and provide power through the same USB-C port. External Battery Packsīattery packs that meet the specifications above can be used with HoloLens 2. Chargers that can't supply at least 5V/1.5A should not be used. It's recommended that HoloLens 2 be charged at 5V/1.5A minimum. If the source is able to supply at least 10 Watts, HoloLens operating time can be extended (potentially indefinitely for some workloads). HoloLens 2 can be charged by USB Power Delivery sources up to 27 Watts. A dialog box will show the battery charge level. Right-click the device, and select Properties. On your host PC, open File Explorer and look for your HoloLens 2 device on left side under This PC. If the battery level is critically low and you try to turn on the device, one light will blink briefly, then go out.When only one of the five lights is on, the battery level is below 20 percent.When your HoloLens is on, the battery indicator displays the battery level in five increments.The last light will fade in and out to indicate active charging. When the device is charging, the battery indicator lights up to indicate the current level of charge.View the LED close to the power button (for a 40-percent charge, you should see at least two solid LEDs). If the device is correctly booted and running, there are three ways to check the battery charge level:įrom the main menu of the HoloLens device UI. BATTERY INDICATOR LIGHT PCThe battery is in pre-charge mode (will stop and go solid after a short time) or that the battery pack is either too hot or cold to charge (outside 0☌ - 45☌).If possible, avoid using a PC to charge the device over USB, which is slow. System thinks battery temperature is outside of -20☌ to +65☌ range and has disabled all functionality for safety/reliability reasons. This helps preserve battery life by minimizing charge cycles and will continue until AC is disconnected. If the system remains connected to AC power and the battery drains to about 80% charge the system will start to charge the battery again (yellow LED will turn back on). Once the battery reaches 100% the system will stop charging and the LED will turn off. Once at 100% the LED will turn off (not turn green) and the system will stop charging so there is no risk of overcharging. The color of the LED will remain yellow until the battery reaches 100%. If the battery LED is flashing red when not checking the battery, see Battery light is quickly blinking red Battery Indicator (when checking battery status) ColorĢ0% or less (charging needed).
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