Extending lifetime of portable systems by battery scheduling
Proceedings of the conference on Design, automation and test in Europe
An interleaved dual-battery power supply for battery-operated electronics
ASP-DAC '00 Proceedings of the 2000 Asia and South Pacific Design Automation Conference
Nonideal battery and main memory effects on CPU speed-setting for low power
IEEE Transactions on Very Large Scale Integration (VLSI) Systems - Special issue on low power electronics and design
Discrete-time battery models for system-level low-power design
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
Battery-conscious task sequencing for portable devices including voltage/clock scaling
Proceedings of the 39th annual Design Automation Conference
An analytical high-level battery model for use in energy management of portable electronic systems
Proceedings of the 2001 IEEE/ACM international conference on Computer-aided design
Battery-Driven Dynamic Power Management
IEEE Design & Test
Energy efficient battery management
IEEE Journal on Selected Areas in Communications
Analysis of discharge techniques for multiple battery systems
Proceedings of the 2003 international symposium on Low power electronics and design
Improving trace cache hit rates using the sliding window fill mechanism and fill select table
MSP '04 Proceedings of the 2004 workshop on Memory system performance
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Many portable devices, like laptops and PDAs can be powered by different combinations of two or more battery packs to give the user the possibility to choose an optimal compromise between lifetime and weight/size. The common discharge policy for multiple battery packs is sequential, i.e., the system switches to the second pack when the first one is empty. In this work we demonstrate that this policy is not optimal by proving the effectiveness of two other policies, namely switched and series, which significantly extend battery lifetime, but require some additional control circuitry. We present a complete implementation of the power supply circuitry and detailed measurements on battery discharge times. Significant lifetime extensions (20 to 30 %) have been achieved for dual-battery systems under high current load.