Phone accessories used to be provided as standard ones with the original purchase. It used to contain, power chrger, head phone and battery. if you are looking for powerbank, USB cables and other accessories buy them from certified vendors and they should match your device. Otherwise it may lead to malfunction and or damage to the device and accessory.
If you are buying them from a foreign land check the powersupply that sholud meet your own country one. Don't forget to get warranty from the seller. If the product need driver get them in CD and place them in safe place as you may need this later. Some driver's cab be found in the internet. Download them from the popular websites only as some other websites used to provide scripts to track you.
Another important thing is about the water proof of the device. If they say that the accessoriy is coming as water proof one. Never put it in the water to check its water proof ability. Some time it is designed for only splash only.
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