MPOJUTA RTP SLOT The battery provides about 27 amp-hours of electrical current, and can be recharged inside the shuttle. This is enough oxygen for 30 minutes, which is sufficient time to get a crewmember back inside the spacecraft. The SOP is an emergency oxygen supply that fits below the PLSS on the backpack frame. The PLSS provides up to seven hours of oxygen supply and carbon dioxide removal.|By using this Site