By a quick search it looks like the battery in question is just a button cell. a standard CR2450 lithium 3V. a quick trip past a drug store would fix it as well if you don't find a software way around it...
On Fri, Sep 09, 2011 at 04:36:38PM -0400, Tim Longo wrote: | An F740 that has been powered off for over a year has some data I | would like to recover. The system boots, but complains about low nvram | batteries, and halts. Is there a way I can bypass this shutdown to | copy some things off? | | Fri Sep 9 16:30:53 EDT [mgr.boot.reason_ok:notice]: System rebooted | after an internal halt. | Fri Sep 9 16:30:53 EDT [kern.shutdown:notice]: System shut down | because : "NVRAM Batteries critically low ". | Fri Sep 9 16:30:53 EDT [statd:error]: The batteries on the NVRAM | board are dangerously low. Replace both batteries immediately! | Fri Sep 9 16:30:53 EDT [monitor.nvramLowBatteries:CRITICAL]: NVRAM | batteries are dangerously low. | Fri Sep 9 16:30:53 EDT [monitor.nvramLowBatteries.notice:notice]: If | the NVRAM batteries are dangerously low, the system shuts down | automatically every 0 hours to encourage you to replace them. If you | reboot the system it will run for another 0 hours before shutting | down. (The 0 hour timeout may be increased by altering the | "raid.timeout" value using the "options" command.) | CIFS local server is running. | | Password: | ok | _______________________________________________ | Toasters mailing list | Toasters@teaparty.net | http://www.teaparty.net/mailman/listinfo/toasters