| 摘要 |
The invention comprises battery monitoring means; generally a circuit (701), for use with a battery (702) which is one of a defined (quantified re volts supplied at known current loads at known discharge levels) type of battery such as the lead-acid batteries used in vehicles. Preferred embodiments monitor at least the battery voltage under load while measuring the drawn current and use stored numerical information in order to determine whether the battery has been discharged down to a predetermined limit; one which generally retains enough charge to perform a defined act such as starting an engine. If the battery is so depleted it is disconnected by switch (716). Additionally the monitor may use temperature measurements. The device is optionally capable of displaying battery charge on an instrument display (704), reconnecting the battery when use is imminent on sensing (712) any change in the load on the bus (703), or initiating a charging procedure.
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