›Product Support Getting Started FAQs Tips Video Tutorials Downloads Manuals Contact Us HomeSupportRCX5FAQsHow do I change RCX5 battery? Selected Product RCX5 (change) FAQs How do I change RCX5 battery? On this page RCX5 uses battery type CR2032. Follow these instructions to change the battery. Polar Service Centers will help you with any questions. Thank you for rating this document.