Power bank - 2016
A custom-made power bank made out of a spare 8000mAh Li-pol battery. The battery is charged using a TP4056 module, the 5V output is provided by a step-up converter module, able to sustain a maximum of about 1A of current, and the battery voltage is displayed by a 7-segment voltmeter module.
To hold it together, I've created a small box from a plastic sheet and glued everything inside it with a silicone sealant.
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