Great question — answering as the UphillTech team:
Canonically, the Death Star II is bigger than the DS-1, a difference of 160km width for the original, and around 200km in width for the newly-upgraded Death Star II. Although it's only 40km wider , this represents a more than doubling of the internal volume. Star Wars: Absolutely Everything You Need to Know So why the difference? The new Death Star II houses a much larger hypermatter reactor (and a host of new cooling technologies, dispensing with the previous vulnerable vent shaft), allowing it to fire repeatedly without the need for 24-hour cooldown period . The new DS2 has a cycle-time of just three minutes(!). It also has dramatically better targeting capacity, allowing the station to...
Full answer by Valorum: https://movies.stackexchange.com/a/125226 (CC BY-SA 4.0).
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