Don't think that's right Calli. The Batteries are the limiting factor in the walks; in fact the EVA time starts when they switch to batteries, even before they open the hatch. I have never heard of them being recharged during a walk (And I listen to the walks live as often as I can). They do however occasionally recgarge their O2 supply.
It appears it would be easier to partially recharge the batteries mid space walk than to partially recharge the O2. Do the astronauts breath very cold oxygen, or do the batteries warm the oxygen? The cold oxygen is warmed by circulating though the suit, perhaps? Neil
IIRC, the Quest Airlock has external tanks for refilling the Space Suits, but have never heard about the batteries, are they Rechargeable or must they be switched with new ones every time ?
Going to check this out now....
Before EVA's the shuttle and ISS space suits are recharged with oxygen (not air since the suits operate at 5.5 psi pressure) and the batteries are recharged. This process is performed before each EVA but not during a EVA.