Like this:
grab the wire in the middle and drag it out. Fold the two legs back over the top of each other (half done here)
Stretch and bend the negative wire (note you need to do it once for each of the pairs) again partially done here:
to get the end product:
and the sketch that produced it:
batteries-Sketch.fzz (5.4 KB)
The same trick works in schematic and has been done in this sketch.
Peter