John from John’s DIY Playground put together a nice video of setting up a Weather Node powered by a PowerShield from a LiPo battery, watch his assembly vide and demo below.
Although you could directly power the Moteino + WeatherShield from a LiPo battery, this is a good example of how you might assemble & use the PowerShield to get 5V from any lower voltage and power Moteino and other sensors for low power operation.
He also shows how to program it and configure it in his IoT Gateway software.
John mentions he made another video of a similar setup, this shows mating only the WeatherShield and a Moteino with integrated antenna. Here it is: