Apology in advance if this has been addressed before, but I'd not noticed any posts telling us how we could reset the Battery Monitor System when we do a DIY battery replacement (lacking a dealer diagnostics tool).
Playing with my old rev 2.1.21 beta version of FORScan this morning I tripped on the "settings" tab only to find an option to reset the Battery Monitor System (!) You've got to be connected to your FE to see this.
Nowhere near needing a battery replacement I didn't 'run' the option, but everything else I've used FORScan for works fine so no reason to doubt this feature and I was glad to find it.
Get FORScan for windows to run on your laptop here (free) Download FORScan
You'll of course need an OBDII > USB interface cable (might also work with a Bluetooth interface, I've not tried that). Search ELM 327 USB for plenty of cheap sources for the interface (NOTE - ignore/don't use the included and totally unnecessary 'driver' mini disk that ships with the ELM .... most all versions I've read about, including the one that came with mine, have a malware / virus on the disk. No driver is needed for the interface to work with Windows, at least Windows 7, it's a standard USB device with built-in firmware support).
Anyway, just FYI for those that would like to DIY replace the battery and skip the dealer completely.
If anyone has another inexpensive tool that offers reset of the BMS, please share. Not being a "DTC" per-se, my 'generic' OBDII scan / DTC reset tool doesn't provide that functionality.