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This wouldn't hurt the battery to charge a device like the iPhone at 240w as opposed to what it would normally charge at on its own like 35w?

The iPhone will only draw as many amps as its charging setup can handle. It doesn’t matter if you connect it to a 10,000-watt charger with a 10,000-watt cable; it will only charge at 30 watts.
 
I'm not sure I would want to jam a high-quality cable with connectors with my keys in my pocket. But it's a cute idea.
Just what I was thinking! My pockets get pretty cruddy depending if I’m working in the garden or under the truck. How does this thing prevent for lint and finer particles from packing the inside of the USB connectors?
 
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