Yes, in the app there is a an option "Become a Charger" which says:

[...] charge Birds at your home or office. Earn up to $100/night. $5 per battery, up to 20 birds

A charge cannot last all day right? It must be charged periodically. I would be suprised if it does not require a charge after every use.

If they aren't, that's a really good idea.