you have to clean the golden contacts of it now and then with some alcohol then it will connect better to the charger. Yes and get yourself two 2000 mA Brand Accus and everything is fine with this mouse.
For designers I just can't recommend Glidepads and Gildetapes not strongly enough.
Glide Tapes and Pads (only for english or german speaking guys :-) No reseller in the USA until now.