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Battery Testers
Battery Testers:  #'s - A      B - D      E - L      M -
S     T - Z

Last Updated on:
Monday, January 01, 2018 04:03 AM

Circuits Designed by Dave Johnson, P.E. :

Measure Button Battery Cell's Internal Resistance   -  The open cell voltage of a small silver oxide button cell battery remains very close to 1.5 volts over most of the life of the cell.  However, there is a relationship between battery health and the internal resistance of the cell.   This circuit when used . . . Hobby Circuit designed by David A. Johnson P.E.-July 11, 2006

Nine-Volt Battery Voltage Monitor  -  This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7.  2 volts.  It uses a LTC1440 comparator, which also contains a 1.  18v reference diode.  In standby mode, the circuit draws only 4uA . . . Circuit by Dave Johnson P.E.-July 09, 2006

NMH/NiCd 6v Battery Tester  -  I designed this circuit to test rechargeable six volt battery packs under constant current conditions.  As designed, the circuit applies a 10 amp load to the battery pack.  A heat sink must be used on the main power transistor . . . Hobby Circuit designed by David Johnson P.E.-December 12, 2004

Resistance Tester got UL Ground Requirement  -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.   This resistance must be tested with actual line current in excess or 10 amps.    The circuit shown uses a couple of LEDs to indicate . . . Circuit by David Johnson P.E.-April 28, 2001

Small Battery Capacity Tester  -  I have a client who uses a lot of batteries.  His sells a device which is powered by a 3v lithium coin cell and he sells thousands of them.  It seems that many of the batteries he has been importing from China have a milliamp-hour capacity which is much . . . Hobby Circuit designed by Dave Johnson P.E.-September 07, 2008


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Make a Simple Circuit Battery Status Monitor  -  Monitor battery status with this easy electric circuit project - no skill required! .   __ Designed by REUK-Renewable Energy UK website

Make a Simple Circuit PC-Based frequency meter   -  04/29/99  EDN-Design ideas –  NOTE:  Scroll to find this circuit.   A simple, low cost, and precision frequency meter uses only two pins of a pc parallel port (Figure 1). The TTL-level periodic input signal with frequency fiN connects to the ACK pin of LPT1. __ Circuit Design by Radovan Stojanovic, University of Patras, Patras, Greece

Measure Button Battery Cell's Internal Resistance   -  The open cell voltage of a small silver oxide button cell battery remains very close to 1.5 volts over most of the life of the cell.  However, there is a relationship between battery health and the internal resistance of the cell.   This circuit when used . . . Hobby Circuit designed by David A. Johnson P.E.-July 11, 2006

Measuring the Capacity of a Battery  -  Find out how to measure the capacity of a battery.   __ Designed by REUK-Renewable Energy UK website

Measuring the Charging & the Discharging Current Of the Battery  -  introduction When we work with rechargeable battery it is useful to have the following functions:* measuring the charging current * measuring the discharging current * measuring the voltage over the batteryBut in order to__ Electronics Projects for You

Microamps Monitor dual-supply batteries  -  03/02/98 EDN Design Ideas:  NOTE:  File contains many circuits, please scroll to find this one  The low-power circuit in Figure 1  monitors two 9V batteries in a dual-supply configuration and turns on the Battery Low LED if either battery voltage drops below its limit.  It also provide as two shutdown signals you can use to turn off voltage regulators, such as Maxim's MAX663/664 positive and negative.   __ Circuit Design by Bruce Anderson, University of Wisconsin--Madison

Micropower DC/DC Converter with Independent Low-Battery Detector LT1304  -  DN120 Design Notes__ Linear Technology/Analog Devices

Model Aeroplane Navigation Strobe/Battery Level Indicator   -  if you are interested in model aeroplanes and have the capital, a radio controlled electric park flyer is a must have.  An RC aeroplane under 400 grams floats around like the rubber models of my youth and contact with the ground doesn't seems to involve that sickening crunch __ Contact r dot p @ webone.com.au

Monitor Battery Voltage  -  11/21/96 EDN Design Ideas:  The circuit in Figure 1 monitors four NIC d rechargeable batteries and causes the LED to flash if the voltage of the batteries goes lower than 4V.  The circuit consumes only 8 mA of current under normal operating conditions.   IC 1 is an eight-pin IC that includes an op amp, a comparator, and a 1.2V zener diode.  The zener diode connects to the negative input of the comparator in the IC as a reference.  R6 and R7 divide the battery voltage __ Circuit Design by Yongping Xia, Philips Lighting Electronics Co, Torrance, CA

Monitor Conserves Battery Energy  -  04/19/12  EDN Design Ideas:  Many battery-powered systems require a visual indication when the battery needs replacement.  LEDs often serve as the indicator, but they can draw as much as 10 mA of current.  This excessive current drain unduly accelerates the battery’s discharging and cu __ Circuit Design by Brian Huffman, Linear Technology Corp, Milpitas, CA

Monitor for 6V/12V Batteries  -  Rechargeable batteries of 6V and 12V are used in a large number of applications.  It is imperative that these are maintained properly to get maximum life out of them.  Further, their__ Electronics Projects for You

Motor Accu Ladder  -  Article is in Dutch __ Designed by Jan Hammer

My New Battery Desulfation/Tester  -  This circuit helps to Desulfate Lead Acid batteries.  Added Bonus: This Circuit also gives a good indication of the internal Resistance of the battery.   __ Designed by G.L. Chemelec

NiCad Discharger for Tx & Rx Packs  -  The reason I designed this discharger are many, however I will list a typical example.  A modeler charges his batteies for 14 hrs, then goes to the field for a fly.  He then rests for a week, then charges his batteries again for 14 hrs and flies again.  The third time, he repeats the procedure, then wonders why his aircraft has a major argument with the runway.  The problem with this method is that he is rechargeing a battey pack which after the first week, is in an unknown state of charge __ Designed by John Nooyen

NiCad Sensor for Heli  -  NIC ad Voltage Monitor for Rx   Circuit + Parts List + Notes __ Designed by Tony van Roon  VA3AVR

Nine-Volt Battery Voltage Monitor  -  This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7.  2 volts.  It uses a LTC1440 comparator, which also contains a 1.  18v reference diode.  In standby mode, the circuit draws only 4uA . . . Circuit by Dave Johnson P.E.-July 09, 2006

NMH/NiCd 6v Battery Tester  -  I designed this circuit to test rechargeable six volt battery packs under constant current conditions.  As designed, the circuit applies a 10 amp load to the battery pack.  A heat sink must be used on the main power transistor . . . Hobby Circuit designed by David Johnson P.E.-December 12, 2004

Optimizing Bluetooth Device Battery Drain Measurements in Manufacturing  -  Application Note__ Aligent

Overload & Reverse Currentry Protects Battery & Load  -  03/01/96 EDN Design Ideas:  Battery-operated equipment is prone to the consequences of backward-installed batteries, accidental short circuits, and other careless use.  The effects of a reversed battery are critical.  Unfortunately, it's difficult to guard against a reversed battery.  To make __ Circuit Design by Dana Davis, Maxim Integrated Products

Preamp & 330 MHz Prescaler  -  A preamp that drives the CMOS counter input and a divide by 10 prescaler to extend the range __ Designed by Dick Cappels

Precision Audio Frequency Peak Detection Probe   -  This is a handy companion for a digital voltmeter.  Its allowed me to do a lot of things I used to use my oscilloscope for, and in addition it measures voltages to much greater precision.  Using an LM324 quad op amp, this peak detector provides 2% measurement accuracy on square waves from 5 Hz to 20 kHz.   __ Designed by Dick Cappels

Prevent Deep Discharge of Battery  -  09/26/96 EDN Design Ideas:  NOTE:    Page includes several designs, scroll to find this one.  mCs such as the 8051 and 8096 and UARTs such as the 82510 provide hardware support for a multiprocessor asynchronous serial-communication protocol (MicroLan].  This featu __ Circuit Design by Rolando Herrero, Instituto Tecnologico de Buenos Aires, Argentina

Protect Battery from Overdischarge  -  04/12/01 EDN Design Ideas:  All electronic circuits powered by a battery discharge the battery.  In some applications, it is undesirable to overdischarge the battery, because it could irreversibly reduce the battery’s capacity and the number of discharge/charge cycles.  The circuit in Figure 1 protectsPDF contains multiple circuits, scroll to find this circuit __ Circuit Design by Martin Wuzik, Implex AG Hearing Technology, Ismaning, Germany

Remote Charging uses Three Wire Sensing  -  05/25/95 EDN Design Ideas:  Remote voltage sensing usually uses a four wire sensing System, this System works with three Wires.    __ Circuit Design by D Hayden, Tempo Research, Vista, CA

Remote control turns battery on & off  -  09/12/97 EDN Design Ideas:  The circuit in Figure 1 acts as a latching solid-state relay.  A short application of a magnetic field in the vicinity of S1 toggles the relay on and off.  The relay switches power from a 3V battery at load currents as high as 10 mA.  This remote switch is ideal for battery-powered applications.  In the off state, the circuit draws no current; in the on state, the circuit draws only 100 µA.  All the parts are inexpensive and readily available.    __ Circuit Design by Allen Harstine,Integrated Measurement Systems Inc, Beaverton, OR

Resistance Tester got UL Ground Requirement  -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.   This resistance must be tested with actual line current in excess or 10 amps.    The circuit shown uses a couple of LEDs to indicate . . . Circuit by David Johnson P.E.-April 28, 2001

RF Inductance Meter  -  needed a way to measure hand-wound RF inductors in my second lab, and since I would only be doing this occasionally, I didn't need anything fancy, and since once a friend finishes his AT90S1200-based design, I plan to make one myself, I figured I'duse this for less than a year, so I didn't want to invest __ Designed by Dick Cappels

Safely Deep-discharges NiCd battery   -  04/29/99  EDN-Design ideas –  NOTE:  Scroll to find this circuit.   Also available at - http://m.eet.com/media/1150682/25098-42999dI     Nickel-cadmium (NIC d) batteries can possess an undesirable memory effect due to partial discharges.  The remedy is a complete discharge before charging again. Figure 1a shows a simple circuit that performs this feat.  __ Circuit Design by Jim Hagerman, Science & Technology International, Honolulu, HI

Sailor’s Battery Meter  -  On a sailboat, the condition of the battery is a major concern for obvious reasons.  On the author’s boat, a 120 Ah lead-acid battery is charged from a 25 watts solar panel.  The battery monitor described here was designed to give peace of mind.  It consists of two sub circuits: a sensor and a control/readoutmust register on this site __ Designed by Published in Elecktor July/Aug, 2010

Self-powered Fast Battery-Tester  -  Tests 1.5 to 15 Volt cells; Two-LED display, no power supply required __ Contact Flavio Dellepiane, fladello @ tin.it

Shunt Regulator Monitors Battery Voltage  -  18-Sep-08 EDN Design Ideas:  A shunt regulator and a handful of associated components function as a battery monitor __ Circuit Design by Vladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine

Simple Circuit Battery-Status Indicator Uses Two LEDs  -  08/12/10 EDN Design Ideas:  Use LED brightness to indicate battery charge.    __ Circuit Design by Abhijeet Deshpande, People’s Education Society Institute of Technology, Bangalore, India

Simple Circuit but reliable car battery tester  -  This circuit uses the popular and easy to find LM3914 IC .  This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source.   __ Designed by Jonathan Filippi

Simple Circuit Car Battery Charger psimages  -  This very simple circuit uses a transformer , two diodes , a capacitor and an ammeter.  To charge a battery just connect+ and terminals of circuit to corresponding terminals of battery.  When battery is not charged, ammeter reading shows 1-3 amps__ 

Simple Circuit car battery Tester  -  This circuit uses the popular and easy to find LM3914 IC .  This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source __ Designed by Jonathan Filippi

Simple Circuit car battery voltage Monitor  -  A Very Simple circuit and some Variations.  Play with it.  All parts are cheap and should be easily obtained.   __ Designed by G.L. Chemelec

Simple Circuit disconnects load  -  02/17/00  EDN Design Ideas:  Placing a load-disconnect circuit on the output of a bootstrapped step-up regulator allows the regulator to start with load currents much higher than would otherwise be possible (Figure 1).  During shutdown, the disconnect completely isolates the battery __ Circuit Design by Larry Suppan

Simple Circuit Disconnects Load From Battery  -  03/14/96 EDN Design Ideas:  To prevent battery damage, the circuit in Figure 1 disconnects the load at a predetermined level of load voltage.  This load voltage, VTRiP, is closely proportional to the battery voltage.  R1 and R2 determine the level of VTRiP  that corresponds to voltage of 1.   15V at pin 3 of IC 1.  A voltage of 1.   15V at pin 3 of IC 1 causes the internal comparator to trip.  Thus, VTRiP=1.   15 (R1+R2) /R1 __ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Simple Circuit indicates a Low battery  -  02/03/14 - EDN Design Ideas:  it may seem a bit counterintuitive to power on an LED when a battery is already low, but this Design idea does it with aplomb __ Circuit Design by James Wood

Simple Circuit Monitors battery voltage  -  11/21/96 EDN Design Ideas:  The circuit in Figure 1 monitors four NIC d rechargeable batteries and causes the LED to flash if the voltage of the batteries goes lower than 4V.  The circuit consumes only 8 mA of current under normal operating conditions.   IC 1 is an eight-pin IC that includes an op amp, a comparator, and a 1.2V zener diode.  The zener diode connects to the negative input of the comparator in the IC as a reference.  R6 and R7 divide the battery voltage __ Circuit Design by Yongping Xia, Philips Lighting Electronics Co, Torrance, CA

Simple Circuit safely Deep-discharges NiCd battery   -  04/29/99  EDN-Design ideas –  NOTE:  Scroll to find this circuit.   Also available at - http://m.eet.com/media/1150682/25098-42999dI     Nickel-cadmium (NIC d) batteries can possess an undesirable memory effect due to partial discharges.  The remedy is a complete discharge before charging again. Figure 1a shows a simple circuit that performs this feat.  __ Circuit Design by Jim Hagerman, Science & Technology International, Honolulu, HI

Small Battery Capacity Tester  -  I have a client who uses a lot of batteries.  His sells a device which is powered by a 3v lithium coin cell and he sells thousands of them.  It seems that many of the batteries he has been importing from China have a milliamp-hour capacity which is much . . . Hobby Circuit designed by Dave Johnson P.E.-September 07, 2008

Solid-state relays simplify Monitoring electric car battery-voltage  -  02/19/04  EDN Design Ideas:  Figure 1 shows the propulsion system of an electric vehicle.  It includes an electric motor, drive electronics, a mechanical transmission, vehicle control/power management, a charging system, and a battery.  The long-term performance __ Circuit Design by Robert Krause, Fairchild Semiconductor, San Jose, CA


Battery Testers
Battery Testers:  #'s - A      B - D      E - L      M -
S     T - Z


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