You should be ok for the first few times with the single series connection, as lipos are usually, and should be in balance from the factory to start off with.

I have heard of one case where they were out of balance though, so don't take my word for it.
All my lipos have been in balance from the start though.

Check each tap with a multimeter regularly to be sure though if in doubt.
I check mine every 2 or 3 charges.

I have had to re-balance mine once so far after 5 charges / discharges.