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 operate at an upper limit temperature of 45°C to no more than 50°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.
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!