The best replacement for cr2450 is cr2032.

The best alternatives to cr2450 are rated as following:
★★★★★  cr2032
★★★★★  dl2450
★★★  cr2354
★★★  cr2450n
★★★  cr2430
★★  lir2450
★  cr2025

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cr2450
cr2032
dl2450