I'd like to make sure I have HR data for an IM (Guessing about 13-15 hours, total race time). If I have 2 separate Scoshe Rhythm units, will my 510 and 920 recognize both of them? If that's true, is there a chance they'll try to sync with others' units?

Maybe this is addressed/handled during initial setup/syncing, but I don't know. Hence my inquiry.............

*edit....my concern is battery life