The Smart Wireless sensors are fitted with a rechargeable lithium-ion battery and can be charged via the USB port. Use the supplied USB lead to connect the sensor either directly to a USB port on your computer, a powered USB hub or a USB mains charger that outputs 5 V at 500 mA or more.  

A full charge can take up to 4 hours. 

Additional Information 

Whenever the sensor is connected to the USB port on the computer or to a USB mains charger (output 5 V at 500 mA or more), it will automatically recharge the battery. 

When connected to a computer, the computer should be turned on and not in sleep or standby mode, as the battery may drain instead of charge.  

The sensor will stay awake for 2 mins when Bluetooth advertising (LED status flashing green). 

Lithium-ion batteries are ‘memory-free’ and prefer a partial rather than a full discharge. Constant partial discharges with frequent recharges will not cause any harm. Frequent full discharges should be avoided whenever possible. Ideally the sensor should be stored at about 40% or more charge. 

The speed at which a lithium-ion battery will age is governed by both its storage temperature (preferably less than 40 ̊C) and state-of-charge.