Spoiler: It's nowhere near 9,000,000mAh!
I seem to be someone who buys things on the off chance that they will be useful at some point down the road. While there are many times when it doesn't feel like this pays off, some of the weird gadgets that I've picked up ended up being super useful, and have become part of the kit I use.
See it now: Fiberglass Scratch Brush on Amazon
Seems like a simple thing, but this really has become a staple repair tool for me. This is the perfect tool for removing corrosion, especially in electrical terminals that have corroded as a result of leaky batteries.
There are also versions that make use of steel or brass bristles, which are effective at removing corrosion, but I don't like to use a material that is electrically conductive.
Caption by: Adrian Kingsley-Hughes
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