Fly BL9200 FS504 Compatible Battery 3.7V 1800mAh Warranty:Warranty 3 Year The 350K's heated probe draws

The 350K's heated probe draws a sharp current spike at initialisation — this is normal behaviour

BM7Vet not completing boot sequence after battery swap

and maintenance-free convenience

it draws a sharp inrush current that can spike well beyond steady-state load

Fly BL9200 FS504 Compatible Battery 3.7V 1800mAh Warranty:Warranty 3 Year The 350K's heated probe drawsFly FS504 Cirrus 2 3. 7V Li ion Replacement Battery (BL9200) This is a 3. 7V, 1800mAh Li ion replacement cell for the Fly FS504 and Cirrus 2 smartphones. It slots into the original battery bay and connects to the device's charge IC and fuel gauge circuit. Capacity is 1800mAh (6. 66Wh), matching the OEM BL9200 specification. FS504 and Cirrus 2 compatibility: Both devices share the same battery bay dimensions, connector pinout, and BMS handshake