But they have a lower voltage, 1.2 volts, not 1.5 volts like alkaline batteries.
But worth a try. Often it works, but check for how long it does.
And better get the ready-to-use types that can hold at least 80% of the charge for a year. Best I know are Eneloop.
long time Eneloop AA and AAA user, ever since they became available in EU, haven't bought any alkalines since. I ordered Eneloop Pro AA specifically to use with SLB300, and haven't experienced "the red light" during the gig/rehearsal yet. did not notice any difference in performance with alkalines that are delivered with a new SLB300.