A guy at my college showed me a portable charger he got for free through a convoluted series of events with the retailer that I couldn't quite follow. He told me that it didn't even manage to charge his phone from dead to 100%. He showed me the back:
Made in China
360000 mAh
...360,000mAh...way to go China pulling a fake number like that out of thin air. Based on the size of the charger it uses a flat pack LiPo battery that was probably no more than 1800mAh or 2400mAh. Since the label is fake the battery probably isn't very good quality either which is why it couldn't even fully charge the phone once.
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I know there is software that you can use that will write to every "available" block of memory. The software will write to the drive whatever amount the drive reports then read back the data. By doing this for every chunk it can determine how many times the drive wrote over itself and the actual size of the drive. Sounds like good software to use on your friends when breaking it to them that they were scammed.