no battery wanring light?

HI I have a 2002 1.4 scenic the problem started last sunday on a trip out when suddenley all the dash warning lights came on for a few seconds then went out then on way home the abs and service light came on.I had this sort of problem before with my saxo so I checked and charged the battery and everything was fine for about 4 days then abs and service light came back on took car to local garage to check battery and alternator and both working fine but they noticed the battery light was not working and said the bulb needs to be replaced I have checked there in no bulb they are led lights so could this be the causing the problem