"Replacing the battery 1 Pull out the battery case. 2 CR2025 lithium battery. {Inguinal! with the + side facing up.) If the range over which the remote control will operate becomes noticeably short, replace the battery. Replace the battery with a Sony CR2025 or Duracell FL-2025 lithium battery. Use of another battery may present a risk of fire or explosion. Replace the battery only with one of the same type and rating. Notes on Lithium Battery « Keep the lithium battery out of the reach of children.