Method and apparatus for indicating a low battery level
First Claim
1. A method for determining the battery level of a rechargeable battery (3) used in a battery-driven apparatus (1) for driving a load (2) and for indicating a low battery level after a last charging, the method comprising a repeating measurement of the battery voltage and a determination of a threshold for indicating the low battery level, wherein the running time of the apparatus (1), while driving the load (2), is accumulated since the last charging, the accumulated running time is repeatedly stored as sequenced data-logger entries (9) in a data-logger memory (7) until a reset of the apparatus (1) due to insufficient battery capacity or until charging of the battery (3), and wherein the threshold is determined after a reset of the apparatus (1) based on the data-logger entries (9) and a required remaining running time of the apparatus (1) upon indication of low battery level.
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Abstract
A method and an apparatus for determining the battery level of a rechargeable battery used in a battery driven apparatus for driving a load and for indicating a low battery level; and a repeating measurement of the battery voltage and a determination of a threshold for indicating the low battery level. The running time of the apparatus while driving the load is accumulated since the last charging and is repeatedly stored as sequenced data-logger entries in a data-logger memory until a reset of the apparatus due to insufficient battery capacity or until charging of the battery. Threshold is determined after the reset based on the data-logger entries and a required remaining running time of the apparatus upon indication of low battery level.
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Citations
13 Claims
- 1. A method for determining the battery level of a rechargeable battery (3) used in a battery-driven apparatus (1) for driving a load (2) and for indicating a low battery level after a last charging, the method comprising a repeating measurement of the battery voltage and a determination of a threshold for indicating the low battery level, wherein the running time of the apparatus (1), while driving the load (2), is accumulated since the last charging, the accumulated running time is repeatedly stored as sequenced data-logger entries (9) in a data-logger memory (7) until a reset of the apparatus (1) due to insufficient battery capacity or until charging of the battery (3), and wherein the threshold is determined after a reset of the apparatus (1) based on the data-logger entries (9) and a required remaining running time of the apparatus (1) upon indication of low battery level.
Specification