Ampere-hour efficiency

The ability of a cell to accept charge or be (re-)charged is measured in terms of the capacity and energy efficiencies of the charge/discharge cycle. The capacity or ampere-hour efficiency of a cell cycled under stated conditions of rate and depth is defined as... 

High ampere-hour efficiency (ratio of charge to discharge) of the battery... 

The Ampere-hour efficiency of the pocket plate battery is 72% when going from the discharged to the fully charged state. The Watt-hour efficiency is approximately 60%. The best plastic-bonded plate batteries have an Ampere-hour efficiency of 85% and a Watt-hour efficiency of 73%. 

Ampere-Hour Efficiency The ratio of the output of a secondary cell or battery, measured in Ampere-hours, to the input required to restore the initial state of charge, under specified conditions (also coulumbic efficiency). 

The current efficiency, or ampere-hour efficiency, of a lead accumulator—(quantity of electricity given during discharge)/(quantity of electricity required for charging)—is higher than 90%. The energy efficiency, or watt-hour efficiency, is given by... 

Charge acceptance of the silver—2inc system is normally on the order of 95—100% efficient based on coulombic (ampere-hour output over input) values. This is tme of any of the charging methods when carried out in the proper manner. Thus overcharge is rarely necessary in charging silver—2inc cells and batteries. 

In the above relationship, Qg is the volumetric quantity of the metal deposited per ampere hour at a current efficiency of 100% (i.e., when p = 1) as per Faraday s law, and can be obtained from the relationship ... 

There is a great deal of confusion surrounding the dewatering efficiency in terms of the significance of the measured electric current and the related problem of liters per ampere-hour (or liters per watt-hour at constant voltage). It has been remarked that experimental efficiencies translate to high and obviously untenable amounts of water per ion. 22The nature of the current and the flux in terms of its various components has been recently elucidated,as follows. 

Dewatering Efficiency in Terms of Liters per Ampere-Hour (or Liters per Watt-Hour at Constant Voltage)... 

A current density of 1000 A/m2 was selected to investigate the effect of initial bromide concentration on bromine production efficiency. The amount of current passed through the cells was 10 ampere-hours for each test. The summary of test results with solutions containing different sodium bromide concentrations is provided in Table 9. 

The efficiency of a galvanic anode is the ratio of an anode weight sacrificed for CP purposes divided by the total theoretical ampere-hours or capacity of the material actually consumed. Galvanic anodes are subject to self-corrosion which uses some of their capacity. This is why the efficiency is less than 100 percent. 

The charging efficiency is high for a VRLA battery. The distinctly high ratio of plate surface area to Ampere-hour capacity allows for higher charging rates and, therefore, efficient charging. 

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