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Probably want to get a USB host OTG cable first then a standard USB cable from the same company since they are very inexpensive cables try to get them from the same company to save on shipping.

For the N7 you'd buy an Asus charger.
Because you'll need its 2A amperage and its coded USB output for rapid charging with high amperage.
ASUS Shop - Nexus 7 10W Adapter and Cable
Harry
Thanks.
Ive got the part that plugs into the mains, its the usb cable I was after since ive damaged it.
So are you saying if I want fast charging I need to buy the cable plus charger as per your link ?
It is depending of how you charge your N7. If you charge while the N7 is on stand-by, different cables whould not make any difference of charging speeds.
Harry
I mostly charge it whilst its turned off, a few times I do charge I whilst its turned on.
).See, the important part is the charger (that plugs into the mains), so you'd use this one which came with your N7 or that Asus (which should be the same).
Harry
Still undecided what to do, that asus 1 is just too expensive, wasn't wanting to spend that much though. Ill see what these 2 cables are like before I buy another cable.

You only might think of this Asus if you haven't this charger anymore which came with your N7.
But you have it, haven't you
Harry