| 摘要 |
A device for extending the operation of a battery operated fan over a indefinite period of time has been disclosed. A battery operated devise such as a large commercial fan can be made to operate indefinitely by installing two batteries in series, and using two charging components to charge each battery separately one at a time as the device is in operation. In so doing the batteries can be refurbished as they are being used eliminating the need for a separate charging operation.
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