Nicely, I also think that a normal AAA battery you (a Duracell is included) has used and no button cells as with other LED lamps. So you can also use rechargeable batteries and must not create a hard disposable waste. The weight is okay, it does not interfere with holding the Kindle.
What I did not like is the cool, almost bluish-looking light. There's even with LED lamps quite pleasant. But you get used to it.