I’ve listened to the Roscosmos stream a bit, they said, the battery of Oleg’s Orlan-MKS spacesuit will be checked - they can’t say right now if it wasn’t fully charged before the EVA, or it discharged quickly. Anyway, there was no danger for Oleg, the problem was noticed in time.
ISS/RS EVA-54: Russian flight control to cosmonauts: "Good job. The main objectives have been achieved. Tomorrow we will do a debrief at 8 o'clock your time"
Russian Spacewalk Ends Early After Battery Power IssueExpedition 67 Commander Oleg Artemyev and Flight Engineer Denis Matveev, both of Roscosmos, were instructed by Russian flight controllers to end the Aug. 17 spacewalk at the International Space Station due to a battery power issue on Artemyev’s Orlan spacesuit.During the spacewalk, the two cosmonauts completed the installation of two cameras on the European robotic arm prior to Artemyev’s Orlan spacesuit showing abnormal battery readings. Mission Control-Moscow instructed Artemyev to return to the Poisk airlock to connect to the space station’s power supply. Cosmonaut Sergey Korsakov, inside the station, is placing the European robotic arm in a safe configuration, and Matveev has just returned to the Poisk airlock. The duo was never in any danger during the operations.
Update: hatch open and hatch close times for VKD54 appear to be 1353:43 to 1755:18 UTC.
It's rather difficult to believe that Roscosmos would initiate an EVA without a fully charged spacesuit battery.
This is exactly what the EVA expert told on the Roscosmos stream. I can only guess, because I don’t know how it works, but probably there’s an indicator which showed the full charge, but it was a wrong signal?