This battery is in the heart rate monitors (Ant+ and Bluetooth). You can order it as a spare.
Mares Puck Pro Dive Computer Replacement Battery Kit
Beidongli CR2450 Battery 3V Lithium Batteries 10 Count
Generic Battery CR2450 replacement battery
Welding Helmet Replacement Batteries - CR2450 — Weldready
CR2450 vs. CR2032: Are they interchangeable?
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Tenergy CR2450 3V Lithium Button Cells 5 Pack (1 Card)
Just found out Key fob uses CR2450 not CR2032
Beidongli CR2450 Battery 3V CR2450 Lithium Batteries (20 Count) - Yahoo Shopping
Lincoln Electric KP4491-1 Viking CR2450 Lithium Battery
Replacement Battery for Energizer CR2450VP (2 Cells per Pack)