Non rechargeable 13 A*h battery. This is great for projects that require a little bit more voltage. Using the hibernate low power mode (0.06uA) it can save battery energy when not transmitting and be able to work even for years.
The battery socket position has changed, in Waspmote PRO it is close to the solar panel socket. Nowit is easier to connect the battery and there is no risk of broken battery cable.
Important note: This power option is not available for GPRS, GPRS+GPS or 3G nodes.
Documentation:
Waspmote Quick Tutorial
Waspmote Site 
Waspmote Technical Guides 
Sensor Boards Technical Guides 
Networking Guides 
Developers Forum 
Videos 
Articles 
50 Applications with Waspmote 
FAQ: Waspmote Vs. Arduino