Because Joan’s E Ink® electronic paper screen uses so little power, you can expect your Joan 6" devices to last for up to 12 weeks and your Joan 13" devices for up to 12 months on a single battery charge.
This was measured and confirmed for ideal working conditions, which include a stable Wi-Fi signal without disconnects and too many clients installed; as well as a good quality access point, enabled office hours (five 8-hour workdays, without weekends), a disabled touchscreen (for Joan 6" device), infrequent image changes and a room temperature of 20° C or 68 ºF.
Joan solutions feature E Ink® electronic paper screens which offer unparalleled energy efficiency and an exceptionally long battery life. No other display technology (for example, LED or LCD) comes even close.
Once every now and then when Joan will have to be recharged, simply detach it from the wall or door and charge it via the enclosed Micro-USB cable.
Joan 6" devices are powered by a high-performance rechargeable 5400 mAh Lithium-Polymer battery, whereas Joan 13" devices boast a 10,800 mAH rechargeable Li-Po battery. To fill up Joan’s battery, simply let the device charge overnight, like you would a smartphone. You can double check battery levels at any time by logging into the Joan Portal and checking the device battery status.
If you wish to charge Joan with a charger instead of the enclosed Micro-USB cable, make sure that the charger you are using is a certified Micro-USB charger with an output rating of 5 V, 1 A max. The power must be supplied from an external power supply source that complies with the requirements for a Limited power source. Using your laptop or PC for charging could mean that your devices might not charge fully when charged overnight.
Factors that influence Joan's battery autonomy
There are a couple of things you can do to reduce Joan’s battery consumption, such as setting office hours and improving the quality of your Wi-Fi signal. This way you can enjoy longer stretches of uninterrupted scheduling.