The SM weighs 60.5 grams (2.13 ounces). A lithium battery weighs 15.5 grams, an alkaline battery weighs 22.5 grams, and a NiMh battery wighs 28.8 grams. The SM with a lithium battery is a formidable lightweight with 6.5 hours battery life, 100 mW RF output and only weighing 76 grams (2.7 ounces).