Since we're discussing this new charge card, they are categorized as "open" not revolving. FICO will not take into account a utilization ratio.
I've also been hearing older models of FICO scoring have used a "highest spending" threshold as a credit limit, but newer FICO scoring models are not so. It honestly wouldn't make sense as to why they'd do such a thing- even one user here mentioned he/she/a friend booked a vacation, charged it, and cancelled at the last minute to "gain a high limit."
That to me encourages purchase-fraud, and doesn't help anyone out.
So really, that leaves your charge card to do a few things well
for your credit score over the long run: boosting your average age of account (longer you have it/length of credit history), always paying in full (payment history), and amounts owed. Again, utilization is not a part of this, though I haven't looked into if they consider utilization with those given a "credit limit of $500-1000" on these Zync cards. Who knows.MyFico has some great standard information about scoring here.
But don't worry about it, always pay in full and on time, and you'll be fine.American Express Zync Card Review
it goes over how much you can earn, the capabilities/disadvantages of the card, and other user feedback as well.
Here's another arbitrary link from BankRate.com too, in regards to charge cards and utilization: Are charge cards bad for credit scores?