Are Stratus portable receivers battery powered?

Stratus 1, 1S, 2, 2S, and 3 include a battery that will provide continuous power for up to 8 hours, which contributes to making operation of Stratus portable receivers wire-free for most pilots. You can charge your receiver using the included 12V DC wall charger. Stratus 2i and 3i are batteryless and receive power from your transponder.