What are the symbols for battery and what looks to be a cell type of connection?
Does your F3-L have the updated 'Multi-function Dash Cluster' that I think the F3-T & L versions came with?? If it does, and you've got a 'battery symbol' that looks sorta like an 'AA' battery or the battery symbol on your cell phone, then I'd guess that those symbols are the 'Smartphone battery level' indicator & the 'Smartphone network connection' level indicator for your Smartphone/cell phone whenever it's connected to the dash!
If the 'battery symbol' is more like a 12 volt car battery symbol, then I've got no idea what the cell type connection symbol might be, but the battery symbol is telling you either the F3's battery is low or dead; its charge system is dead; or there's some other electrical system fault....