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Extensions really aren't recommended for charging. Any poor connection will introduce resistance and consequent heating - that's at the internal connections within the equipment as well as the external connections with the pins. For instance, the fuse holder in a plug is a typical point of failure, as the connections can be quite small. 10A is enough current to do significant damage if there is a problem - it can melt a coiled-up extension lead for instance. By adding an extension lead, you are virtually tripling the possible number of poor connections, and in regular use the possibility of a poor connection will do nothing but increase. So only use an extension lead if you are 100% sure that there are no poor connections anywhere in the circuit between the first plug and your car every time you use it.
 

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