This seems quite smart from Sena; a battery pack that will charge your Sena or any other 5v USB related devices. "But Eric, I already have a battery pack for charging..." Yes, but while I love my XP-10 from Antigravity Batteries, the amp draw from my Sena devices are below its threshold and it will shut itself off before my Sena's fully charged. The Powerbank goes down to 1.6 amps. And it's small! Weighs just 5 oz.