Battles are judged very differently to the more 'style' based Classic competitions. They are judged on how technically difficult the displayed slalom is. However, this is not the same as judging based on the technical difficulty of the tricks attempted or executed by the skater.
Battle judging is very much about doing the tricks, yes, but also finishing them off, and being able to link them with other skating, other than crisscross, or other run-up/recovery tricks and maintaining the general flow of the slalom. No marks are awarded, or scores given, since the judges simply rank the skaters within the battle group, however the following aspects are taken into account when ranking:
Finishing off tricks:
If a skater shows a trick which they maintain control off from the start of the trick until the end of the trick, it shows a greater technical achievement than if a skater loses control of the trick during execution, and 'collapses' out of it, even if each trick lasted a similar length of time or number of cones.
Continuity & Flow:
If a skater executes a sitting trick, abruptly stands up before doing some freestyle, before pushing off to gain momentum for a wheeling exit from the cones, this shows a lower technical achievement than another skater who smooths the transitions between the different phases of their line.
This is very important from an aesthetic point of view too, however aesthetic benefits are not involved in the judging procedures of battle competitions, and is not the reason why this is included.
Integration with other freestyle:
Tricks which are not integrated well into other freestyle slalom show a lower technical achievement both overall, but also for those very tricks. If a technically difficult trick is entered from more 'freestyle' slalom, instead of from a clear 'setup', then this shows a greater risk taken by the skater. The same works for the trick-exit – it shows a good mastery of the trick if the skater is able to transition well from the trick itself, into something other than crisscross, for example.
Range of tricks:
If a skater covers a wide range of tricks, instead of just focusing on one skill, such as being able to play around on one or two wheels, then it shows technical achievement in a range of different types of skills.
One example could be someone who focuses specifically on the heel wheel might show a lower technical level than someone who, whilst learning some tricks on the heel wheel, also has taken time to train the toe wheel and other non-wheeling tricks.
Another example would be someone who shows a strong focus on only wheeling tricks, compared to another skater who does some wheeling, along with many other more creative tricks.