CPC H02J 7/0045 (2013.01) [H02J 7/0013 (2013.01); H02J 7/342 (2020.01); H02J 50/10 (2016.02)] | 14 Claims |
1. A battery charging device, comprising:
a number of base units each having a first interface and a second interface, the first interface configured to receive a first battery and the second interface configured to receive a second battery;
a first of the number of the base units is configured to retrieves power from the first battery wherein when the first battery is attached to a second of the number of the base units and transmits power to the second battery wherein when the second battery is attached to the first of the number of the base units; and
both the first and second interfaces of each of the number of base units are located on a position where the first battery and the second battery are interchangeably attachable.
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