Gordon: There are black plastic "rivets" which hold the two halves of the SAT. Use a stiff wire to push in the center of each rivet, which will fall inside. Remove the rivets, and the two halves will separate. The battery pack will be seen glued inside the back half. You can remove the pack, and replace it with another pack of NiCads, or (never tried it) NiMH batteries. Solder the new pack in, and reinstall the two halves with the rivets (collect the center pieces which had fallen inside) and push those pieces into the rivets to lock. Done. Best, Paul McCloud San Diego
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