# Smart Battery System

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Smart battery management specification

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**Smart Battery System** (**SBS**) is a specification for managing a [smart battery](/source/Smart_battery), usually for a [portable computer](/source/Portable_computer). It allows [operating systems](/source/Operating_system) to perform [power management](/source/Power_management) operations via a [smart battery charger](/source/Smart_battery_charger) based on remaining estimated run times by determining accurate [state of charge](/source/State_of_charge) readings. Through this communication, the system also controls the battery charge rate. Communication is carried over an [SMBus](/source/SMBus) two-wire communication bus. The specification originated with the Duracell and Intel companies in 1994, but was later adopted by several battery and semiconductor makers.[1] [2] The Smart Battery System defines the SMBus connection, the data that can be sent over the connection (*Smart Battery Data* or SBD), the Smart Battery Charger, and a computer [BIOS](/source/BIOS) interface for control. In principle, any battery operated product can use SBS.

Texas Instruments BQ20Z45: SBS 1.1-compliant gas gauge and protection enabled with impedance track

A special [integrated circuit](/source/Integrated_circuit) in the battery pack (called a fuel gauge or [battery management system](/source/Battery_management_system)) monitors the battery and reports information to the [SMBus](/source/SMBus). This information might include battery type, model number, manufacturer, characteristics, charge/discharge rate, predicted remaining capacity, an almost-discharged alarm so that the PC or other device can shut down gracefully, and temperature and voltage to provide safe fast-charging.

## See also

- [List of battery types](/source/List_of_battery_types)

- [Power Management Bus](/source/Power_Management_Bus) (PMBus)

## References

1. **[^](#cite_ref-1)** Henk Jan Bergveld, Wanda S. Kruijt, Peter H. L. Notten *Battery management systems: design by modelling* Springer, 2002 [ISBN](/source/ISBN_(identifier)) [1-4020-0832-5](https://en.wikipedia.org/wiki/Special:BookSources/1-4020-0832-5) pages 20-22

1. **[^](#cite_ref-2)** Peter, Anton. ["AC DC power adapter"](https://pacolipower.com/). Retrieved 30 April 2023.

## External links

- [SBS-IF Smart Battery System Implementers Forum](https://sbs-forum.org/)

- [Battery Firmware Hacking Inside the innards of a Smart Battery](https://media.blackhat.com/bh-us-11/Miller/BH_US_11_Miller_Battery_Firmware_Public_WP.pdf)

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Adapted from the Wikipedia article [Smart Battery System](https://en.wikipedia.org/wiki/Smart_Battery_System) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Smart_Battery_System?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.