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5572136 Electronic battery testing device  
An electronic device for testing storage batteries and other dc sources is disclosed. The testing device passes a small, time-varying, current through the battery and observes the resulting...
5570025 Annunciator and battery supply measurement system for cellular telephones  
A cellular phone both annunciates and retrieves stored mail messages using a single keypad button. A cellular basestation transmits voice mail messages to the cellular phone indicating that voice...
5561380 Fault detection system for electric automobile traction system having floating ground  
A fault detection system detects the existence of unwanted electrical paths between the high voltage traction system of an electric car and the chassis of the car. The fault detection system...
5550475 Programmable battery charge indicator  
A programmable battery charge indicator including a pair of electrically-conductive terminals coupleable to a test battery; a user-actuated and timer-controlled power delivery mechanism coupled...
5537024 Circuit arrangement to detect a voltage  
In a circuit arrangement to detect a voltage (U), the voltage is applied to the input of a voltage detector (VD) through a voltage divider (R1, R4), the voltage detector (VD) comprising a...
5528149 Test circuit for back-up battery  
A test circuit for a back-up battery includes a main switch which connects a main power source to a load, and a diode which is interposed between a back-up battery and the load. The diode is...
5518835 Device for indicating the residual capacity of secondary cells  
A device for and a method of indicating the residual capacity of a secondary cell, that needs be recharged using a simply constituted device, correctly and within a short period of time. The...
5511435 Apparatus for measuring vehicle running condition  
A battery-powered rotation detector detects passing of a rotating magnet attached to a vehicle wheel to generate and transmit a rotation signal. A receiver receives the rotation signal. A...
5485090 Method and apparatus for differentiating battery types  
The cell type of a battery is determined by characterizing the series resistance behavior of various cell types to determine ranges of series resistance values exhibited by batteries of a...
5479103 Non-linear voltage measuring implementing capacitor charging time  
The value of an unknown voltage is measured by applying a time-varying current from a reference voltage source through a resistor to a capacitor thereby to increase the voltage across the...
5475295 Electronic device capable of checking power supply status  
An electronic device is disclosed having a main body and being in communication with a remote controller capable of transmitting and receiving signals to and from the electronic device. The main...
5473201 Control circuit means for controlling the after-running of an operating device in a motor vehicle  
A control circuit arrangement for controlling the after-running of an operating device in a motor vehicle is described, with which after shutting off the ignition the operating device is provided...
5451881 Method and means for adjusting battery monitor based on rate of current drawn from the battery  
In a preferred embodiment, a metering system for measuring and indicating the state of charge of an electrical storage battery, including: apparatus for storing a numerical value indicative of the...
5438270 Low battery tester comparing load and no-load battery voltage  
A test circuit (200) furnishes a low battery level signal on the basis of a comparison between a first ratio of the battery potential when the battery (206) is unloaded and a second ratio of the...
5426371 Automatic battery and charging system tester with motor-driven carbon pile loading  
A battery and charging system tester includes an automatically-operated carbon pile for loading the battery, the pile having a shaft therethrough rotated by a stepper motor, and a compression nut...
5424722 Device for displaying remaining electric energy of battery  
A display device has a time-constant circuit and a switching element such as a transistor for supplying the voltage of a battery to the time-constant circuit when a battery check key is pressed. A...
5416402 State of charge indicator for deep-cycle application  
A state of charge indicator monitors a voltage produced by a depletable energy source and provides an indication when the state of charge of the depletable energy source falls below a...
5402070 Fault-tolerant elective replacement indication for implantable medical device  
A pacemaker having a fault-tolerant elective replacement indicator (ERI) triggering scheme in which transient excursions of parameters used as criteria for triggering ERI are rejected as...
5386575 Electronic apparatus and method for detecting the value of voltage supplied by a power source during the operation of an input and/or output device on the basis of test data sent to the input and/or output device  
An electronic apparatus and method includes a memory for storing data to be sent to an input and/or output device, a transmitter for transmitting data stored in the memory, a power source for...
5376887 Battery tester with apertures for plural types and sizes of cells  
A low profile battery tester uses tapered apertures to located batteries in a thin tablet shaped body for testing. In one embodiment for conventional dry cells, the taper is in openings through...
5357203 Battery monitoring circuit for operating with high battery discharge rates  
A battery detect circuit (32) is connected to the battery with the current input to the battery and extracted from the battery measured with a sense resistor (50) and then converted to charge and...
5352982 Method and apparatus for displaying a residual electric charge of a battery for an electrically driven vehicle  
In a method and apparatus for displaying a residual electric charge for a battery of an electrically driven vehicle, the battery's capacity is detected after the battery is charged. This...
5315253 Method and apparatus for measuring the voltage and charge of a battery  
Method and apparatus for measuring the voltage and state of charge of a secondary battery. The voltage and state of charge values are taken by a circuit every four (4) seconds by reading voltage,...
5293156 Hand tool driven by DC battery with multiple level battery condition indicator  
A hand tool driven by a DC battery comprises a tool driving section having a motor, a DC source connected to the tool driving section, a plurality of LEDs connected to the DC source, an LED...
5287286 Low-battery state detecting system and method for detecting the residual capacity of a battery from the variation in battery voltage  
There is provided a low-battery detection reference voltage table for memorizing the correspondence between current values and low-battery detection reference voltage values, which is obtained...
5272380 Electrical supply control system for a motor vehicle  
A typical motor vehicle has an electrical storage battery (BT) to power its electrical facilities (L), including facilities which normally consume current when the vehicle is left unattended. A...
5254951 Circuit for measuring discharging and charging current of a battery providing offset/drift voltage for correcting amplifier output  
A current measuring circuit for measuring discharging current and charging current of a battery, which is selectively connected to a load and a charger. The current measuring circuit comprises a...
5250904 Device for predicting imminent failure of a stationary lead acid battery in a float mode  
A stationary battery testing device as provided for measuring imminent battery failure while the battery is in a float mode. The device includes a circuitry for measuring the internal resistance...
5241275 Method of measuring remaining capacity of a storage cell by comparing impedance plot characteristics  
The remaining capacity of a storage cell, particularly a valve regulated lead-acid cell, is determined by measuring its impedance at typically two or three relatively low frequencies f, e.g.,...
5239286 Battery alarm system  
A battery alarm system for generating an alarm on recognition of the reduction of an output voltage of a battery, wherein an analog output voltage value of a battery is converted to a digital...
5170124 Method and apparatus for monitoring fuel cell performance  
A method and apparatus for monitoring the performance of fuel cells arranged in series. More particularly, the method and apparatus involve the measurement and comparison of fuel cell performance...
5166623 Method for indicating battery capacity  
Battery capacity in a portable two-way radio is determined by measuring the voltage across the battery at predetermined time intervals and determining battery voltage slopes. Each battery voltage...
5157247 IC card  
An IC card has a data transmission/receiving circuit for exchanging data with an external device, a data processing circuit connected to the data transmission/receiving circuit for processing the...
5140269 Electronic tester for assessing battery/cell capacity  
A self-contained electronic device instantaneously assesses the stored energy capacity of single, two-volt, lead-acid cells; or of batteries comprised of such cells. The testing device is...
5136246 Apparatus with intermittent enabling means for detecting end of battery life  
An apparatus used in a system powered by a battery for detecting end of battery life. The apparatus includes an electromotive force comparing circuit getting power supply from a battery for...
5130699 Digital battery capacity warning device  
A voltage monitor and method enables the monitoring of a DC input voltage. The input voltage is continuously scanned and compared to a predetermined threshold. The result of the comparison is...
5122751 Device for detecting residual capacity of a battery both in load and no load conditions  
A device for detecting and displaying residual capacity of a battery comprises a comparator comparing detection voltages set to predetermined values and open circuit voltage. The device further...
5111148 Battery voltage discriminator circuit  
A battery voltage discriminator circuit for an apparatus having a battery and a plurality of loads which are driven by the battery and operate under various kinds of load conditions is disclosed....
5099210 Battery status indicator  
A circuit for monitoring and indicating the outut level of an energy source, such as the voltage level of a battery. The circuit includes a triangle wave generator, and a comparison circuit for...
5099209 Battery voltage detecting device  
A battery voltage detecting device has a circuit for separately detecting the time it takes for a capacitor to be charged to a second reference voltage, in response to the application of a battery...
5095308 Transceiver with battery saver and method of using same  
A portable transceiver has a battery saving feature which includes a timer, circuit which automatically cuts off the power supply to the receiver and transmitter for relatively long intervals and...
5057779 Temperature independent voltage monitor for use in a battery operated electronic device  
A voltage potential monitoring circuit is operative to set a voltage potential threshold substantially independent of ambient temperature variation. The monitoring circuit includes a first circuit...
5036284 Monitor circuits for battery charging and other applications  
A monitoring circuit for a battery charger, with utility in other applications, includes a main input that receives an initial signal such as the terminal voltage of a battery being charged, and a...
5027294 Method and apparatus for battery-power management using load-compensation monitoring of battery discharge  
A method and apparatus for monitoring the voltage discharge of a battery power supply while under load, and to manage the power supply by accurately calculating the time the useful charge is...
4990885 Auxiliary battery monitor  
The electrical system of a vehicle includes a primary voltage source for starting and operating the engine of the vehicle and an auxiliary voltage source for operating the electrical accessories...
4968942 Method for monitoring aircraft battery status  
An aircraft storage battery is monitored to determine battery capacity, state of charge and certain fault conditions. The ambient temperature, battery voltage on-board charger output voltage and...
4943777 Battery voltage warning device  
A battery voltage condition indicator in which the battery voltage is periodically sampled and a warning indication is given if the battery voltage falls below a predetermined relatively high...
4937528 Method for monitoring automotive battery status  
A vehicle storage battery is monitored to determine battery capacity, state of charge and certain fault conditions. The ambient temperature, battery voltage alternator/regulator output voltage and...
4931738 Battery monitoring system of cell groups and display  
A battery monitoring system has an LED matrix displaying plural battery group conditions. The matrix has a column defining reference row of LED indicators, each active LED representing an adjacent...
4906055 Voltage level judging device  
A device for determining whether a source voltage from a power source to be applied to a load such as an electrical apparatus is below a standard level but above a specified level or below this...