The electrical current in China is 220 volts. You will see a variety of plugs in China, including two flat prongs (the same as American plugs), or three flat prongs (the same as Australian ones). The British three square-pin arrangement is rare outside of smart hotels, and it is therefore advisable to carry a travel conversion plug, readily a travel in most of the larger cities. A power-surge cable will protect laptops against voltage fluctuations, which are common in China. It is best to avoid cheap batteries, as they are very short lived. Instead, buy a battery charger and rechargeable batteries, which can be easily found in most Chinese stores. Blackouts are not unheard-of in China, so, given the erratic power cuts, it is wise to carry a flashlight.