Battery life has been ok so far.
Battery life will vary based on apps used etc. For me, battery life has been the same as iOS 11.4.
FWIW - I ran DB1 and now DB2. It's fast. Since DB2 ( = PB1?) everything *I* use works fine. But it definitely burns the battery more than 10 or 11, which is not a surprise for a beta.
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Yes, DB2 doesn't "pulverize" the battery but runtime is definitely shorter.
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Thanks all. Doesn't seem to affect battery life noticeably on my iPhone 6 Plus. I'll probably download it to my iPhone X soon.