USOS Extravehicular Activity (EVA) #52: Today Anne McLain (EV-1) and Nick Hague (EV-2) exited the Joint Airlock and performed US EVA #52 (Lithium Ion Battery R&R EVA #1) with a Phased Elapsed Time (PET) of 6h 39m. The primary purpose of this EVA was to facilitate the installation of new P4 Li-Ion batteries and completed …