⚠️ Note: Some of the information in this article reflects behavior prior to firmware version 3.9.29. As of 3.9.29, charging power now dynamically adjusts based on battery temperature, and charging will automatically resume after cooling.
This article remains available for context on how the system functioned previously and may still be useful for understanding thermal behavior.
The Yarbo uses a Lithium Ion battery, with an advanced battery management system. (BMS) Batteries of this type perform best in a specific temperature range. This is handled in the winter months by a battery heater that is built into the unit, insuring that the battery remains sufficiently warm during operation, and charging.
During summer however, especially when the Yarbo's charging dock is exposed to intense sunlight, as is usually the case, given the appropriate placement guidelines for the charging dock, the battery can sometimes become too hot to charge efficiently.
You may notice that your Yarbo returns to the dock to recharge, but charging does not immediately begin, and the app currently (as of the publication of this article) will display a message stating that the Yarbo is not properly aligned with the charging dock. Should this occur, you should check not only the positioning of the Yarbo, but also the battery temperature on the diagnostics screen in the app.
The battery is meant to charge at an upper limit temperature of no more than 55°C. During operation, even in hot weather the battery should remain below this temperature. Charging however, generates additional heat, which on hot days will push the battery temperature beyond these limits, and charging will stop. Charging will resume as soon as the battery has cooled below the operational upper limit temperature.
Note: the battery overheating protection mechanism doesn’t rely solely on the temperature shown in the Diagnosis page.
Instead, Yarbo uses internal cell-level readings (specifically from Cell 1 and Cell 2) to make decisions about whether to suspend charging. The value you see in the app is meant as a reference to help monitor general temperature conditions, but it doesn’t always reflect the most accurate internal cell temperature used for system logic.
That’s why in some cases, charging may still continue even if the displayed temp is near or slightly above 50°C. However, the protection system will activate once the internal sensors detect critical thresholds.
The Yarbo team has been made aware of the need for a message specific to heat related charging delay, in order to differentiate from alignment-related issues.
Enjoy your Yarbo!