The no-name charger I bought is just over who invented portable chargers inch in length, excluding the Eurpopean-style plug. The charger is labeled “FOR iphone4. I opened up the charger with a bit of Dremel-ing.
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One surprise is how much empty space is inside for a charger that’s so small. The power supply itself is slightly smaller than one cubic inch. The picture below shows the main components. On the left is the standard USB connector. Note how much room it takes up – it’s not surprising devices are moving to micro-USB connectors.