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(April 2003) Advancements in battery rapid-testing How accurate is AC conductance?

Not just a concept to provide greater information about battery charge conditions, Electrochemical Impedance Spectroscopy (EIS) now provides data to show superior performance. The electrochemical characteristics of a battery are determined by applying an AC potential at varying frequencies and measuring the current response of the electrochemical cell. Written by our Expert, Isidor Buchmann

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(April 2003) Question: What factors affect Charging at high and low temperatures?

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(September 2002) Multi Task Charger Lead-acid PowersMultitasking Starter-Charger - portable power at a reasonable price.

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 TheMicro500XL Advanced Battery Conductance & Electrical System Analyzer by Midtronics includes advanced algorithms for testing the new Absorbed Glass Mat (AGM) batteries and enhanced capabilities and features to improve the electrical testing capabilities of the installed and battery reseller. The MicroXL series is designed to help installers provide better battery maintenance by finding problems before the consumer gets stranded.

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(August 2002) Midtronics receives patent for the inGENTM In-vehicle battery monitoring system. (See BD #61, pp.1-2.) The patent covers a method for measuring a vehicle batterys state-of-health in real-time while the vehicle is operating. Midttronics states, The inGen uses interactive battery-analysis and conductance testing to achieve battery diagnostics without the use of battery-design table data or charge mapping techniques, which are vulnerable to error as the battery ages and changes.

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Battery Charging and Analysis (January 2002)


The difference in charging Nickel-cadmium and Nickel-metal hydride rests in the damage which can occur to Nickel -metal hydride on overcharge, which is not a problem with Nickel-cadmium. Therefore, the most popular minus delta V of Nickel-cadmium using constant current must be changed to cell temperature cutoff which begins to increase when the cell is fully charged. Nickel-cadmium cells like to be charged at above the C rate to limit dendrite growth. Lithium-ion chemistries are to be charged with current limited constant Voltage charging to the Voltage limit.

from Battery Power Products & Technology, December 2001, pp. 13-14


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Software Extends Battery Life (January 2002)

Many electric and hybrid-electric vehicles use Nickel-metal hydride batteries which are five to six times more expensive than valve-regulated Lead-acid batteries (VRLA). A major concern about VRLA batteries is their relatively short deep cycle life. Investigators have created software to extend the life using a Current Interrupt Charging Algorithm which is claimed to extend the cycle life of VRLA batteries by a factor of three to four. This technology could also be use in wheel chairs, sweepers, golf carts, forklifts, and emergency lighting.

from R & D Magazine, September 2001, p. 50

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TI charges up smart battery ICs


Texas Instruments announced At Power 2001, new integrated circuits targeting Smart Battery System gas gauging and higher efficiency regulators. The chip sets can reduce the number of components by as much as 40%. These devices are compatible with the trend toward totally embedded rechargeable batteries. Higher efficiency will increase run time and reduce heat generated in the electronics.(12-01 BD69-13)

from EE Times, October 1, 2001, p. 2

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Frost & Sullivan presents 2001 Marketing Engineering Awards to companies making a positive contribution in the battery charger industry. Receiving awards were: AeroVironment, Inc., Midtronics, Inc., Motorola Energy Systems Group, and Schumacher Electric Corporation.(12-01 BD69-10)

 Smart technology fuels battery charger markets. The pressing challenge for manufacturers is to develop chargers that avoid overheating the miniaturized battery, which generally has the highest risk of overheating when charged. Some manufacutring firms are using sophisticated electronics that switch the charging mode to reduce the amount of heat generated. (Data is from U.S. Battery Charger Markets by Frost & Sullivan, www.frost.com.) +(12-01 BD69-10)

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Battery Charging and Analysis (02-01, BD70-13)

The difference in charging Nickel-cadmium and Nickel-metal hydride rests in the damage which can occur to Nickel -metal hydride on overcharge, which is not a problem with Nickel-cadmium. Therefore, the most popular minus delta V of Nickel-cadmium using constant current must be changed to cell temperature cutoff which begins to increase when the cell is fully charged. Nickel-cadmium cells like to be charged at above the C rate to limit dendrite growth. Lithium-ion chemistries are to be charged with current limited constant Voltage charging to the Voltage limit.

from Battery Power Products & Technology, December 2001, pp. 13-14

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Software Extends Battery Life


Many electric and hybrid-electric vehicles use Nickel-metal hydride batteries which are five to six times more expensive than valve-regulated Lead-acid batteries (VRLA). A major concern about VRLA batteries is their relatively short deep cycle life. Investigators have created software to extend the life using a Current Interrupt Charging Algorithm which is claimed to extend the cycle life of VRLA batteries by a factor of three to four. This technology could also be use in wheel chairs, sweepers, golf carts, forklifts, and emergency lighting.


from R & D Magazine, September 2001, p. 50

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