That 25 mph is not all horizontal, and any downward movement would mean less power drain from the drone. Though I'd definitely agree that the battery life is a pretty big problem.
I'm sure they will also sell a Lily branded external battery that can be kept in your backpack and used to recharge it.
Maybe, but the FAQ states the current battery isn't replaceable. So it seems more likely they'd have to come out with an entire new unit in order to have external batteries.
It doesn't seem like something they're interested in for the launch.
Since they're using the upfront pre-order money to cover manufacturing costs, I would bet enough feedback from customers (or even speculative customers) asking for a 30 min minimum would have enough impact for them to source different batteries or reduce weight. Features like this can make or break a flashy new product like Lily.
I'm sure they will also sell a Lily branded external battery that can be kept in your backpack and used to recharge it.