batterycharger for mignon batteries & 2300 mAh NiMH Accu

Overview of functions
- Automatic rapid charger for four NiCd/NiMH mignon/micro storage batteries, 180-3300 mAh.
- The charging procedure is started automatically after the batteries have been inserted.
- Four independent charging compartments. Charge current max. 1,1 A per battery with simultaneous charging.
- Battery full detection through peak voltage detection.
- Maximum charging result - low warming of batteries during the charging procedure, through intelligent charging controller.
- Automatic switch to trickle charge after end of charging.
- Automatic forming of damaged batteries.
- Quadruple display - simultaneous display of functional and charge state of all batteries in the display.
- Battery capacity measurement.
- Battery analysis function.
- Battery recycling function - the battery is charged until no further increase in capacity can be measured.
- Selective battery choice - via the cursor, the functions for each charging compartment can be set individually.
- Battery defect detection.
- Safety timer (5h) for faulty cells
- Wide-range input for world-wide use (90-250 VAC).
- 12VDC Input (10,5-16V) 
 
 
 

Battery analysis
Each charging compartment has an LCD display assigned to it. Running, ascending segments and the numeric capacity display (Ah) provide information about the capacity and the quality of all the batteries, relative to one another.
Any cell in a battery pack or group whose capacity value lies clearly below the value of the other cells should be replaced, since the cell with the lowest capacity determines the performance of the battery pack or battery group.
The Akku-Trainer III is thus also a battery analyzer. Poor batteries are identified and can be replaced individually, instead of replacing the whole battery pack. This is good for the environment, and saves money.

Charging
As long as no batteries are inserted, the display reads "nob" (no battery). This means that there are no batteries in the charging compartment.
When a battery is inserted, rapid charging starts automatically, and is indicated on the display by ascending segments. During charging a clock symbol and elapsed time are displayed.
After charging has been completed, the "battery full" symbol appears (all segments lit), and the energy index is shown on the display.
Capacity measurement
When the discharge button is pressed briefly, the discharge procedure is triggered. Information about the progress of discharging is provided by descending segments in the battery symbols, and the simultaneous numeric display.
The discharged capacity is the measure of the battery capacity. When the end-of-discharge voltage is reached, the measured capacity (Ah) is stored in the memory. The charging procedure is now started automatically.

Reading the capacity
The last measured capacity (last discharge procedure) can be read in the display via the "Capacity check" button, for all batteries simultaneously.

Recycling
By pressing the discharge button for longer (approx. 2 seconds), the battery is discharged and charged repeatedly until no further increase in capacity can be measured. This training of the batteries should be carried out from time to time. The recycling procedure can last for several hours.

Forming
Batteries that have been damaged (cell short) are detected on insertion. The forming process (repairing batteries) is initiated automatically, and For appears in the display.
In the event of successful forming, the device switches over to charging after 5 minutes. If forming is unsuccessful, Err appears in the display; the battery should be disposed of properly.

Overvoltage
Expired batteries are dried out inside and have a high natural voltage. This state is detected and is indicated in the display by bAd. The battery is unusable and should be disposed of properly.

Selecting the charging compartment
Each battery can be selected and dealt with individually, by pressing the button "ú". The charging compartments are independent of one another.

Other special features of the Akku-Trainer AV4 with display

Battery-full criteria
Charging takes place according to thePVD method (peak voltage detection). This ensures that the batteries are charged to 100%. During charging, the battery characteristics are constantly monitored by the microprocessor, and the charge current is switched off when a 100% charge is reached ¨C not too early, and not too late. With other charging methods, e.g. using timers, batteries are often overcharged. If batteries are overcharged, they heat up markedly after just a few minutes. This heating as a result of overcharging is one of the most frequent causes of premature failure of batteries.

Optimum charging conditions
In many chargers, power components are located in the vicinity of the battery compartments, and cause so-called "hot spots". These hot spots frequently cause the charge current to switch off prematurely, thus leading to premature and incorrect "battery full" detection.
With this device, an intelligent microcontroller ensures perfect charging behavior. In the development of the device, care was taken that no power components are located in the vicinity of the battery compartments.

Energy index - comparative measurement
The energy index is used to show the relative capacity of all the charged cells compared to each other. This allows for quick analysis of battery packs and thus enables restoration of the initial efficiency, in case individual cells degenerate prematurely.
This is achieved by referencing each cell with the one of highest capacity (energy index 1.00). All the other cells are evaluated relating to this value, e.g. cell 2: EI 0.81, cell 3: EI 0.97, cell 4: EI 0.96.
This example shows that cell 1 is best, cells 3 and 4 only slightly below, but cell 2 is significantly degenerated. In this case cell 2 should be replaced, if it is to be used in conjunction with the other cells.
A comparative measurement is of course only meaningful when done with equal cell types of same nominal capacity.

more information in the manual (90kB pdf)

Technical data
Input voltage: 90 - 250V AC 
Power consumption: 18W 
Max. charge current per compartment: 1,1A 
Size of plug power pack: 90 x 65 x 95 mm 
Size of charging part: 145 x 70 x 45 mm 
Weight: 380g (plug power pack and charger) 
 
 

AkkuTrainer AV4	69,00 Euro	order
4 NiMH Mignon batteries 2300mAh	13,90 Euro	order

 

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