It seems like it would be expensive, and upgrading it later (for faster charging, different batteries etc) would be expensive too, no?
I bought this for $39.95 to charge my mouse:
http://www.mobeetechnology.com/the-magic-charger.html
and then there are these:
http://www.amazon.ca/s/?ie=UTF8&keyw...l_5zkdeuxip9_b