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1. (WO2019045939) HOT-PLUGGABLE DUAL BATTERY WITH PASS THROUGH CHARGING
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WHAT IS CLAIMED IS:

1. An electronic system, comprising:

a first device including:

a first charger port;

a first battery;

a memory; and

controlling circuitry coupled to the memory; and

a second device including:

a second charger port, and

a second battery;

the controlling circuitry of the first device being configured to:

in response to the first device being in a first state, direct electrical power from the first device to the battery of the second device via a connection between the first charger port and the second charger port; and

in response to the first device being in a second state, direct electrical power from the second device to the battery of the first device via the connection between the first charger port and the second charger port.

2. The electronic system as in claim 1 , wherein the first charger port is a

universal serial bus (USB) Type C port.

The electronic system as in claims 1 or 2, wherein the first state of the plurality of states is indicative of a battery of the first device having a greater percentage of charge than a battery of the second device and the second state of the plurality of states is indicative of a battery of the first device having a smaller percentage of charge than a battery of the second device.

The electronic system as in any of claims 1-3, wherein the first device further includes:

a first current path over which electrical current flows at a voltage equal to an adapter voltage;

a second current path over which electrical current flows at a voltage equal to a system voltage, the system voltage being less than the adapter voltage; and

switching circuitry that switches between the first current path and the second current path to produce electrical current that provides the electrical power to the second device when the first device is in the first state of the plurality of states.

5. The electronic system as in claim 4, wherein the first device further includes regulator circuitry in the second current path, the regulator circuitry being configured to convert electrical current flowing at the adapter voltage to electrical current flowing at the system voltage.

6. The electronic system as in claim 4, wherein the controlling circuitry is further configured to output a control signal to the switching circuitry, the control signal indicating whether the first device is in the first state or the second state of the plurality of states.

7. The electronic system as in any of claims 1 -6, wherein the second device further includes:

memory; and

controlling circuitry coupled to the memory, the controlling circuitry of the second device being configured to:

send a request to the controlling circuitry of the first device, the request indicating that the controlling circuitry of the first device direct electrical power to the battery of the second device;

in response to the first device being in the first state of the plurality of states, receive electrical power from the first device and directing the electrical power to the battery of the second device; and in response to the first device being in the second state of the plurality of states, receive no electrical power from the first device.

8. The electronic system as in claim 7, wherein the second device further

includes:

a first current path over which electrical current flows at a voltage equal to an adapter voltage;

a second current path over which electrical current flows at a voltage equal to a system voltage, the system voltage being less than the adapter voltage; and

switching circuitry that switches between the first current path and the second current path to produce electrical current that provides the electrical power to the first device when the first device is in the second state of the plurality of states.

9. The electronic system as in claim 8, wherein the second device further

includes regulator circuitry in the second current path, the regulator circuitry being configured to convert electrical current flowing at the adapter voltage to electrical current flowing at the system voltage.

10. The electronic system as in claim 8, wherein the controlling circuitry of the second device is further configured to output a control signal to the switching circuitry, the control signal indicating whether the first device is in the first state or the second state of the plurality of states.

1 1. A method, comprising:

in response to a first device being in a first state of a plurality of states, directing electrical power from the first device to a battery of a second device via a connection between a first charger port of the first device and a second charger port of the second device; and

in response to the first device being in a second state of the plurality of states, directing electrical power from the second device to a battery of the first device via the connection between the first charger port and the second charger port.

12. The method as in claim 1 1 , wherein the first state of the plurality of states is indicative of a battery of the first device having a greater percentage of charge than a battery of the second device and the second state of the plurality of states is indicative of a battery of the first device having a smaller percentage of charge than a battery of the second device.

13. The method as in claims 1 1 or 12, wherein the method further comprises:

performing a switching operation between a first current path of the first device and a second current path of the first device to provide the electrical power to the second device when the first device is in the first state of the plurality of states, the first current path over which electrical current flows having a voltage equal to an adapter voltage, the second current path over which electrical current flows having a voltage equal to a system voltage, the system voltage being less than the adapter voltage.

14. The method as in claim 13, performing the switching operation includes

converting electrical current flowing at the adapter voltage to electrical current flowing at the system voltage at a regulator in the second current path.

15. The method as in claim 13, further comprising outputting, by the first device, a control signal indicating whether the first device is in the first state or the second state of the plurality of states.

16. The method as in any of claims 11 -15, further comprising:

sending a request to the controlling circuitry of the first device, the request indicating that the first device direct electrical power to the battery of the second device;

in response to the first device being in the first state of the plurality of states, receiving electrical power from the first device and directing the electrical power to the battery of the second device; and

in response to the first device being in the second state of the plurality of states, receiving no electrical power from the first device.

17. The method as in claim 16, further comprising:

performing a switching operation between a first current path of the second device and a second current path of the second device to provide the electrical power to the first device when the first device is in the second state of the plurality of states, the first current path over which electrical current flows having a voltage equal to an adapter voltage, the second current path over which electrical current flows having a voltage equal to a system voltage, the system voltage being less than the adapter voltage.

18. The method as in claim 17, wherein the method further comprises converting electrical current flowing at the adapter voltage to electrical current flowing at the system voltage.

19. The method as in claim 17, further comprising outputting, by the second

device, a control signal indicating whether the first device is in the first state or the second state of the plurality of states.

20. A computer program product comprising a nontransitive storage medium, the computer program product including code that, when executed by processing circuitry of a first device, causes the processing circuitry to perform a method, the method comprising:

in response to the first device being in a first state of a plurality of states, directing electrical power from the first device to a battery of a second device via a connection between a first charger port of the first device and a second charger port of the second device; and

in response to the first device being in a second state of the plurality of states, directing electrical power from the second device to a battery of the first device via the connection between the first charger port and the second charger port.