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RTC keeps the current time while Neo FreeRunner is off or suspended. Rechargable lithium backup battery should keep clocks running for hours when main battery is flat or removed, but it has limited lifetime.
RTC backup battery (BAT1701: HB414-IVO1E) can be replaced by electrochemical double layer capacitor (EDLC), like XH414H-II06E (apparently obsolete, not recommended for new design) or EECEN0F204 (500 Hrs @ 60°C) (datasheet). These supercapacitors have much longer lifetime and they are less sensitive to heat from solder iron than lithium baterries.
(search digikey.com) ? What terminal type?: