Charger for Mignon batteries & 2300 mAh NiMH rechargeable batteries

Features
- Automatic rapid charger for four NiCd / NiMH Mignon-/Micro-storage batteries 180-3300 mAh 
- The charging process starts automatically, after the batteries have been inserted 
- Four independent charging compartments. Charge current max. 1A per storage battery, while charging. 
- Storage battery full identification 
- Maximum charging result with Peak-Voltage-Detection (PVD)
- An intelligent Temperature-Controller ensures only little warming of the storage batteries during the charging process 
- Discharge function - prevents the Memory-Effekt in NiCd-storage batteries 
- Automatic formatting of damaged storage batteries 
- Recognition of defective batteries
- Wide range input for worldwide use (90 - 250 VAC) 

Automatic rapid charging
When a storage battery is inserted, the rapid charging process starts automatically. Storage batteries of different types (NiCd/NiMH), sizes (Micro AAA, Mignon AA) and capacities can be loaded simultaneously, because the storage compartments operate independent from eachother. Each storage compartment has a green LED display assigned to it. During the charging process, the green LED flashes every second. When the charging process is finished, the green LED shows a steady light. Charged batteries can remain in the instrument. When the battery is fully charged, the instrument automatically switches to a trickle charge. To countertact self-discharge (leakage current), during trickle charging the batteries are charged with a low pulse current. 

Discharge function
When you press the buttom marked "t", all batteries are discharged simultaneously.During the process, the red LED flashes. When all batteries are discharged, the instrument automatically switches to rapid charge and the green LED's  are flashing. NiCd-batteries should be discharged from time to time, in order to counteract the so-called memory-effect. Its loss of capacity is caused by the fact, that prior to re-charging the batteries are often not fully discharged. Being discharged, NiCd-cells regain ther full "power". Note: the memory-effect does not occur in NiMH- batteries. 

Formatting
Damaged batteries are detected on insertion. The formatting process (repairing batteries) is initiated automatically. During formatting(approx.5 min) the green LED flashes every 1/4-seconds. When the battery is successfully formatted, the instrument automatically switches to rapid charging. When the process is not successful, the green LED flashes every 1/16-seconds and the battery should be disposed properly. 

Overvoltage 
Expired batteries are "dried out" inside and have a high natural voltage. The state is detected and the green LED flashes every 1/16-seconds. The battery cannot be used any longer and should be disposed properly. 

More special features of the Akku-Trainer I AT1 Battery-full-criteria
Charging works according to the PVD- (Peak-Voltage-Detection) method. This ensures, that the batteries are charged to 100 %. While charging, the battery characteristics are constantly monitored by the microprocessor and the charge current is switched of  when a 100 % charge is reached. With other charging methods, e.g. using timers, the batteries are often overcharged. Then they heat up after just a few minutes. This overheating 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 vivinity of the battery compartments and cause so-called Hot Spots. These "Hot Spots"  often cause the charge current to switch off prematurely thus leading to premature and incorrect "battery full" detection. With this instrument,  an intelligent temperature controller ensures perfect charging behaviour. When this charger was developed, care was taken that no power components are located close to the charging compartments. 

Overview LED functions 
4 x green LED's, one per charging compartment
- flashes every second = battery is beeing charged 
- steady light = battery is fully charged 
- flashes every 1/4-second = battery is beeing formatted  (duration approx. 5 minutes) 
- flashes every 1/16-second = battery is defective
red LED
flashes every 1/2-second = discharging process 

Technical data
Input voltage: 90 - 250 VAC
Power consumption: max. 15 W
max. charging current per compartment: 1 A
Dimensions: 145 x 70 x 45 mm
Weight: 350 g
 

AkkuTrainer I

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