Hi..
There is plenty of stuff on the interweb, showing how other people managed to remove the battery "Hat" of a NOVRAM, and wired in an external cell.
Check these links out...
NVRAM to RAMTRON FM18W08 FRAM replacement.
New external battery for NVRAM
Reworking the DS1287 / DS1387 RTC chip
Dallas Semiconductor DS1387 Module Rework/Battery Replacement
All the above links checked and are working.
"Have Fun"!
73.
Dave 'KBV
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