1998 Sportster 1800 - wont turn over,with plugs in.. battery issue?

[lauramsportster1800]

1998 sportster 1800 twin rotax - spins with plugs out, but when plugs are in it just stalls and makes a locking sound. Battery has been iffy - has enough juice to bilge pump and stereo - but i think it is too low to start things up. When i put the fob on the doss the "beep beep" is very quiet. I checked the battery with the multimeter and its at 11.3v. Could this be an electrical/battery issue?

 

[mikidymac]

It is the battery, get a new one.

 

[lauramsportster1800]

Thanks, recharged them and it started fine today