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Go Gentle into the Good Night via Controlled Battery Discharging

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Published:27 July 2015Publication History

ABSTRACT

Prevalent battery management approaches for mobile devices treated a battery's residual capacity as a given budget and tried to make the best of this budget by turning off lower-priority tasks. In contrast, the research reported in this paper aims to maximize the quantitative value of a battery's residual capacity by operating the battery according to its discharge characteristic curves (DCC), which describes a battery's discharging dynamics in terms of the correlation among its voltage level, capacity and discharging current. According to the DCC theory, it is possible to increase a battery's effective capacity in terms of Ampere hours by capping the discharging current in a certain way after its capacity falls below a threshold. This paper describes a DCC-based Battery Discharging (or DBD) technique that is capable of automatically deriving a battery's DCC, using the DCC to determine a suitable instantaneous discharge current budget, and limiting the total discharge current under that budget. Measurements on an operational prototype show that DBD is capable of extending a battery's residual capacity by more than 20% after its SOC is reduced to 30%.

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  • Published in

    cover image ACM Conferences
    APSys '15: Proceedings of the 6th Asia-Pacific Workshop on Systems
    July 2015
    152 pages
    ISBN:9781450335546
    DOI:10.1145/2797022

    Copyright © 2015 ACM

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    Publication History

    • Published: 27 July 2015

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