Originally Posted by Madart

The car has a Battery Monitoring System which controls the alternator feed to the battery. Apparently when a new battery goes in this cannot relearn the new battery info itself and has to be reset, so a trip to the dealer may be in order.- try ringing a dealer and speak to the service manager to confirm this.

Check the wiring to the battery first- there is a thin wire to the monitoring system and if this is broken or worn it can cause the light.

Originally Posted by clubairth1

The BMS will reset on it's own. It is not required to be reset when changing the battery. You can if you want to for sure.
See the first line from the attached service manual. It does it automatically from time to time.
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Originally Posted by John Williams

It's a fuselink which is a length of lead which melts if there is a short, but won't blow with a surge which of course an ordinary fuse would. I would give the wire a tug to check if it has failed or test with a meter.