While it's been confirmed by Nokia already, the team over at WeLoveWP.hk have run some tests on charging the Lumia Windows Phone with a number of options. Turns out when put up against generic USB chargers (eg. Apple), USB ports and another Nokia charging unit, the Nokia Lumia adapters provided more charge for a faster rate of recharge.

Check out the summarised results below:

Computer USB 2.0 port: 3.85V - ~110mA

Nokia DC-11K Mobile Charging Unit: 3.9V - 330mA

Apple Charger: 3.88V - 300mA

Lumia 800 AC-16 Charger: 3.95V - 600mA

Should you have a Nokia Lumia charger in your procession, using it over your PC (or other USB based chargers) will pump the juice into your Lumia handsets at a faster rate.

Source: WeLoveWP.hk