Integrated monitoring capacity of a power bank battery and devices charged therewith

A power bank device, comprising:

• a battery for supplying electric charge to a battery of a rechargeable device external to the power bank device, via an electrical connection between the power bank battery and a rechargeable device battery, the power bank battery having a nominal capacity;
• one or more transceivers configured to exchange communication signals with the rechargeable device and a remote server;
• and
• one or more processors;
• and
• a non-transitory memory storing computer executable instructions that, when executed via the one or more processors, cause the power bank device to:
• determine the nominal capacity of the power bank battery,
• measure a present capacity of the power bank battery,
• compare the present capacity of the power bank battery to the nominal capacity of the power bank battery to determine a health value of the power bank battery, and
• transmit to a remote server, via the one or more transceivers, an indication of the health value of the power bank battery when the health value is less than or equal to a threshold value.