Steripen-adventurer 4 oz
Sunlinq 6.5W PV Solar Charger 7 oz
4 RCR123s with charger 4oz
Total Weight 15oz
For what it's worth, SteriPEN offers a solar charger/case (with batteries) for the Adventurer and Traveler models (suggested retail $79.95). The Adventurer and charger can be purchased as a package (suggested retail $149.95).
http://www.steripen.com/steripen_products.html