Awesome because it had a machine that rented phone...

Awesome because it had a machine that rented phone chargers!!! $3.25 USD for 24 hours. You're only there as long as your event so why keep it overnight?
On the bright side if you did maybe forget to return it, it's only 45$. Don't think you can keep it and have yourself a portable charger, it's the machine they come out of that charges them.
That being available made it where you didn't have to hang out at a "charging booth" and wait in airplane mode to just get enough to make sure you can still GPS to the nearest freeway after taking photos and videos through the whole event. Most people can get home once they know where they are.
I did NOT like $8.50 a bottle of water....