Systems and methods for enabling multiple battery backup units in a system

1. An information handling system comprising:

an information handling resource;

a power input for receiving electrical energy for powering the information handling resource via a power bus; and

a battery backup unit for supplying electrical energy to the information handling resource via the power bus in response to a power event affecting an ability of a power supply unit to deliver electrical energy to the power bus, the battery backup unit configured to, in response to the power event:

generate a regulated output voltage having a first voltage magnitude for a first period of time to limit power generated by the battery backup unit to a first power magnitude during the first period of time; and

after the first period of time, generate the output voltage having a second voltage magnitude lesser in magnitude than the first voltage magnitude for a second period of time to limit power generated by the battery backup unit to a second power magnitude lesser in magnitude than the first power magnitude during the first period of time, wherein the second power magnitude is a function of a continuous maximum power supported by the battery backup unit based on characteristics of the battery backup unit.

2. The information handling system of claim 1 , wherein the information handling resource is a persistent memory, and the second period of time is a time sufficient for the persistent memory to perform a save operation.

3. The information handling system of claim 1 , wherein the battery backup unit is further configured to decrease the output voltage in a plurality of steps from the first voltage magnitude to the second voltage magnitude during a third period of time intermediate to the first period of time and the second period of time.

4. The information handling system of claim 1 , wherein the second period of time is a time sufficient for the information handling resource to perform a graceful shutdown.

5. The information handling system of claim 1 , wherein the second period of time is a time sufficient for the information handling resource to perform a memory save operation.

6. A battery backup unit for supplying electrical energy to an information handling resource via a power bus in response to a power event affecting an ability of a power supply unit to deliver electrical energy to the information handling resource via the power bus, the battery backup unit configured to, in response to the power event:

generate a regulated output voltage having a first voltage magnitude for a first period of time to limit power generated by the battery backup unit to a first power magnitude during the first period of time; and

after the first period of time, generate the output voltage having a second voltage magnitude lesser in magnitude than the first voltage magnitude for a second period of time to limit power generated by the battery backup unit to a second power magnitude lesser in magnitude than the first power magnitude during the first period of time, wherein the second power magnitude is a function of a continuous maximum power supported by the battery backup unit based on characteristics of the battery backup unit.

7. The battery backup unit of claim 6 , wherein the information handling resource is a persistent memory, and the second period of time is a time sufficient for the persistent memory to perform a save operation.

8. The battery backup unit of claim 6 , wherein the battery backup unit is further configured to decrease the output voltage in a plurality of steps from the first voltage magnitude to the second voltage magnitude during a third period of time intermediate to the first period of time and the second period of time.

9. The battery backup unit of claim 6 , wherein the second period of time is a time sufficient for the information handling resource to perform a graceful shutdown.

10. The battery backup unit of claim 6 , wherein the second period of time is a time sufficient for the information handling resource to perform a memory save operation.

11. A method comprising, in a system comprising a battery backup unit for supplying electrical energy to an information handling resource via a power bus in response to a power event affecting an ability of a power supply unit to deliver electrical energy to the information handling resource via the power bus, in response to the power event:

generating a regulated output voltage having a first voltage magnitude for a first period of time to limit power generated by the battery backup unit to a first power magnitude during the first period of time; and

after the first period of time, generating the output voltage having a second voltage magnitude lesser in magnitude than the first voltage magnitude for a second period of time to limit power generated by the battery backup unit to a second power magnitude lesser in magnitude than the first power magnitude during the first period of time, wherein the second power magnitude is a function of a continuous maximum power supported by the battery backup unit based on characteristics of the battery backup unit.

12. The method of claim 11 , wherein the information handling resource is a persistent memory, and the second period of time is a time sufficient for the persistent memory to perform a save operation.

13. The method of claim 11 , further comprising decreasing, by the battery backup unit, the output voltage in a plurality of steps from the first voltage magnitude to the second voltage magnitude during a third period of time intermediate to the first period of time and the second period of time.

14. The method of claim 11 , wherein the second period of time is a time sufficient for the information handling resource to perform a graceful shutdown.

15. The method of claim 11 , wherein the second period of time is a time sufficient for the information handling resource to perform a memory save operation.