I have an old smartphone and battery can be an issue. But an external battery can help for sure.
Sometimes I go to explore without my phone as it localizes me anytime (and it can be hazardous to leave "tracks"). In general, I don't like to depend on technology in lightpainting, especially when it involves a smartphone. You can call me old-fashionned^^
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No, quite the opposite! It's not old-fashioned! I use discarded smartphones without a card for my DIY tools, anonymized if possible. I think that would be an option.