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What is the difference between rated capacity and usable capacity in a power bank?

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When you buy a power bank, battery capacity is one of the first things people tend to look at. You will see products advertized at 20,000mAh, 50,000mAh, 100Wh, 200Wh and above. Sure, a higher capacity is appealing, as https://www.google.com/goto?url=CAESbQHEIkXX1oPhvJb2HEuB7BPAuhYWpbY1U3THY0T17rDKB7jJ9S8PPy5nKj1mSwPdzj3uKoyfsyC6JezeLrW4bFLDDqI7XN2rzRjDYbVVsm2DeHse-PktiTxMmgbxvxp-yr_Ag4zndISajfH9Izs&gsessionid=sEuv6n9OTDynFd-9UdWX5FV3lRUTNpTiiI3JNibhjqPkDGt1sdWKzQ

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