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Rev. 2004.04.26 

AL-4 Page 2 

MULTI PRPOSE OPERATION 

 

AL-4 is a Multi purpose simultaneous quick Charger that will charge a completely discharged IDX 
NP-L NP type Lithium Ion Battery in approx. 2 and ½ hours. It can also charge NP type Ni-Cd or 
NiMH batteries in approx. 90 minutes and BP type NiCd batteries in approx. 2 and ½ hours and BP 
type NiMH batteries in approx. 4 hours. The AL-4 can charge 4 batteries regardless of chemistry 
simultaneously. 
 
The charger automatically searches each channel for a battery to charge, in a continuous loop. The 
charging simultaneous loop is interrupted only by the detection of a valid battery to be charged. The 
AL-4 Charger automatically checks a battery’s chemistry & type charges it accordingly. 
 

OPERATING INSTRUCTIONS 

 

A.

 

Connect AC power cord firmly. 

B.

 

Set the power switch ON (Green LED will light). 

C.

 

Basic Operation

:-  

 
 

For NP-L Lithium Ion Battery’s 

1) Insert a battery

 

- Standby mode, AL-4 Charge channel LED is orange, while the 

charger is checking the battery ‘s Chemistry/

 

2) Battery Check

 

-

 

Within 5 seconds the LED will turn to Red indicating that the 
AL-4 Charger is in fast charge mode. If a battery is low voltage 
the AL-4 Charger will be in slow charge mode, until the battery 
reaches fast charge capability, LED will remain Orange. If a 
battery can not pick up the Fast charge or if a battery becomes 
excessive over charge then the Orange LED will start flashing 
indicating Battery Fault.

 

3) Fast Charging

 

- When a battery is at 12v LED will turn to Red indicating that the 

AL-4 Charger is in fast charge mode.

 

4) Charge End

 

- When the battery is fully charged the LED will turn to Green, 

indicating that the battery is ready to use.

 

   

For Nickel Cadmium or Nickel Metal Hydride Batteries:- 

1) Insert a battery

 

- Standby mode, AL-4 Charger LED is orange, while the charger is 

checking the battery’s Chemistry.

 

2) Battery Check

 

- Within 5 seconds the LED will turn Red for start charging 

indication. If a battery is low voltage then the AL-4 Charger will 
be in slow charge mode, LED will remain Orange until it charges 
up to fast charge capacity. If a battery can not pick up the Fast 
charge or if a battery becomes excessive over charge then the 
Orange LED will start flashing indicating Battery Fault.

 

3) Fast Charging

 

- When a battery is at 11v LED will turn to Red indicating that the 

AL-4 Charger is in fast charge mode.

 

4) Charge End

 

- When the battery is fully charged the AL-4 will turn to trickle 

charge for NiCd and NiMH batteries and the LED will turn to 
Green, indicating that the battery is ready to use.

 

 

LED COLOUR STATUS LIST 

 

Solid Red .......................... Quick Charge in progress 

Solid Green ...................... Charge complete, battery ready 

Solid Orange .................... Standby mode or slow charge mode 

Flashing Orange .............. Defective battery 

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