The memory takes power to maintain. Until now, the watch battery has kept your memory while you have the AAA's out, but it must have died. Replace the watch battery, and in the future keep use two sets of AAA's on a rotating basis, so that the calculator always has a set in it. >I have Aurora installe, but now it seems that everytime I take the >batteries out to recharge them, the mem gets cleared. Is this supposed >to happen?