Razer have made some interesting choices with their Hyperflux wireless mouse and charging mat.  The Mamba Hyperflux does not contain a battery, instead depending on a constant flow of energy from the FireFly Hyperflux powered mouse mat or via the provided USB cable if you want to forgoe the wireless capabilities altogether.  It seems this choice came with a price, Kitguru has seen it for sale at £249.95, the US price at Amazon is a similar number, which makes this quite expensive comparatively.  Is it worth the cost or are you just paying extra for a unique feature?  Check out the video review for Kitguru's thoughts.

"Creating a light gaming mouse has always been a challenge for one simple reason – it needs a battery. That’s what we thought, at least, until Razer introduced its Mamba Hyperflux gaming mouse. It weighs just 96g and simply does not have a battery – instead, it uses magnetic induction to receive power directly, thanks to the use of a supercapacitor."

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