I just bought some Duracell rechargeable batteries and use them almost exclusively for my wii remotes. There are also some good Wiimote charging docks from Nyko and other brands I'd recommend.
http://www.amazon.com/CEF14-Duracell-Value-Stay-Chargered/dp/B000XSBVMU/ref=sr_1_4?ie=UTF8&qid=1385786404&sr=8-4&keywords=duracell+rechargeable+batteries