Turns out minute/battery handlers run on startup automatically -_('_')_-

src/c/main.c

@@ -746,9 +746,6 @@ static void init() {
 	layer_set_update_proc(s_temp_layer, temp_update_proc);
 	layer_set_update_proc(s_fuel_layer, fuel_update_proc);
 
-	update_minute_1();
-	batt_callback(battery_state_service_peek());
-
 	app_message_register_inbox_received(inbox_received_handler);
 	app_message_open(255, 64);