24 Volt 4 Amp Switch Mode Battery Charger


  • 5 Stage charging cycle

  • Suitable for batteries up to 34 AH in cyclic application

  • Suitable for up to 50 AH in a standby or float application

  • Fully Automatic Operation

  • Compact and Light weight

  • Fully overload protected (auto-recovery)

  • Simple LED charging indicator


Input:                            90-260 VAC 
Frequency:                 47-63Hz 
Protection:                 Internal Primary
Isolation:                      Input-Output 3000VAC
                                           Input-Case 2500 VAC
                                           Output-Case 500 VAC

Safety:                            Designed to IEC 950

EMI-EMC:                    FCC Class B, CE, C-TICK
Standard:                      AS 3193
 Input Connection:   3 Core SAA Cable IEC


Case Dimension:  105L  X  207W  X  60H
Casing Material:   Extruded Anodized Aluminum
Weight:                     1 Kg.
 Cooling:                    Convection Cooled
Warranty:                 12 Months


Topology:                                            Switching DC Power
Efficiency:                                           85%
Boost Charge Voltage:                29.4VDC
Float Charge Voltage:                 27.6VDC
Output Charge Current:            4 Amps
 Ripple & Noise:                               150 mV
Line Regulation:                              +/- 0.5% Over Input Range
Load regulation:                              +/- 1% 0-100% Load
Rise Time:                                            500 mS
Hold-up Time:                                   20 mS@Nominal Output
Short Circuit Protection:            Output Shutdown
Over Current Protection:           Primary Power Limited
Reverse Polarity Protection:     Internal Relay 27.6VDC


Operating Temp. Range:   -5  degrees Celsius to 50 degrees Celsius
Storage Temperature:        30 Celsius to +85 Celsius
Relative Humidity:              10% to 90%
Altitude:                                     0-3000m

Common Specifications

2404 is use for 12-cell batteries

Mains Input Voltage:  90-260 VAC Mains
Frequency:  47-63 Hz Efficiency 85% max.
Total Output Regulation: +/-5%0
Operating Temperature: 0-40 Celsuis
Operating Humidity:  10-90% RH
Safety:  Meets CSA T-mark
EMI: FCC Class B, CE, C-Tick
Aust. Standard Approvals:  AS/NZ 3350.2.29
Max battery capacity:  24V to 80% in 8 hours 33 A.H.


Charging Characteristics

  • Automatic boost charge 

  • Automatic preservation of fully charged condition 

  • Insensitive to fluctuations in mains voltage and mains frequency


IMPORTANT! This type of charger must be connected to the battery before being switched ON.

Connect to the non-chassis terminal of the battery first then make chassis connection. Ensure the points of connection are well clear of the automobiles fuel lines.  When the charging process begins, the GREEN LED illuminates.  After reaching approx. 80% charge, the GREEN LED will turn OFF, BUT LEAVE BATTERIES CONNECTED UNTIL READY FOR USE. To check that battery is fully charged, turn AC power OFF for about 30 seconds then turn back ON. The LED should light momentarily then go OFF. This battery charger may be left connected to a fully charged battery indefinitely as overcharging is impossible.  

Always turn AC power OFF before disconnecting charger from battery. To ensure a full charge in the shortest time and the longest possible battery life, make sure all leads and connectors are clean and undamaged.


The 2404 Switch-mode Charger should be installed in a moisture-free environment. Care should be taken to ensure that both the charger and the battery are securely mounted and positioned with adequate ventilation!


1. Check that connectors on lead from charger to battery are correctly wired i.e. RED to positive (+) and BLACK to negative (-).

2. Check all connections thoroughly and that the power switch of charger and the AC mains are turned ON.

 3. If a short circuit or reverse connection is accidentally applied to the output, the charger will immediately shutdown. Remove the short circuit or reverse polarity connection turn-off charger and re-connect to battery correctly and turn charger back on to resume normal charging operation. 

4. Note that the green light may not immediately come on if the battery is extremely deeply discharged, the charger will not charge a battery under 8 volts for a 12 volt battery, OR 16 volts for a nominal 24 volt system.

5. If the LED does not go OFF within 12 hours, your battery should be tested at the place of purchase.

6. During the first charging phase, the charger may become quite warm or hot to touch — this is normal if charging deeply discharged batteries.

7. Do not attempt to charge a battery with other equipment attached which draws current.

If you need this option, consult your vendor at the place of purchase.


Switch the charger OFF and remove the AC plug from the wall socket and check the AC power lead, charging leads and connectors for any damage, do not use the charger if any damage is discovered, return to your supplier for repair. Reconnect in the approved manner, and turn on charger. If it is still not working, call your supplier for advice &/or return the charger complete with original packaging and leads for testing, remember that the green light may not immediately come on if the battery is extremely deeply discharged — The charger will not start charging if the battery is under 8 volts for a 12 volt battery and 16 volts for a 24 volt system.


This charger is not intended for use by children or the infirm. Please ensure adequate supervision if they are to use the charger. The charging process can cause the battery to generate explosive gasses, always ensure both charger and battery are provided with adequate ventilation. Keep clear of sparks or other ignition sources. This charger must never be used on non-rechargeable batteries.


There are no user serviceable components inside. Service personnel should ensure that the AC line source is disconnected prior to the case being opened for service. If the mains power cord is damaged, it must only be replaced with an approved type.