The I2420 is an industrial charger designed for all standard lead acid, AGM and GEL batteries from as low as 0.5V.

Part no. 40-274


Industrial 20A charger for a variety of battery types

The I2420 can be customized with different charging curves depending on battery type and application. It also records parameters from the last 200 charging cycles for compliance. I2420 has Drive Off protection and is robust with IP64 aluminum casing. The I2420 also has intelligent cable loss compensation for even faster charging and uses advanced technology for its high frequency switch mode. With conversion efficiency up to 94%, the I2420 means low CO2 emissions and lower power usage in general.


  • Logging and saving 200 charge cycles
  • Multi step, fully automatic charging cycle
  • Charge current: 20A
  • Easy to read LED indicators
  • Automatic reconditioning for deeply discharged batteries
  • 2-year warranty

Technical data

220–240 VAC, 50–60 Hz, 3.0 A
28.8 V, 20 A
Battery capacity
40–600 Ah
Back current drain*
Corresponding to less than 1 Ah/month
Battery voltage
24 V
Ambient storage temperature
-40 °C to +70 °C
Ambient operating temperature
-20 ˚C to +50 ˚C (- 4 °F to +122 °F)
Start voltage
0.5 V
Less than 4 %
Battery types
24 V:; WET; can be customized for AGM, GEL, LiFePO₄
Degree of protection
Gross weight (unit in box)
2.08 kg
Dimensions (L x W x H)
193 x 148 x 74 mm
Net weight (unit with cables)
1.4 kg
2 years
*) Back current drain is the current that drains the battery if the charger is not connected to the mains. CTEK chargers have a very low back current.
**) The quality of the charging voltage and charging current is very important. A high current ripple heats up the battery which has an aging effect on the positive electrode. High voltage ripple could harm other equipment that is connected to the battery. CTEK battery chargers produce very clean voltage and current with low ripple.
CTEK issues a limited warranty to the original purchaser of the product. Depending on the product, the limited warranty period will vary. The limited warranty is not transferable. The warranty applies to manufacturing faults and material defects. The warranty is void if the product has been handled carelessly or repaired by anyone other than CTEK or its authorized representatives. CTEK makes no warranty other than this limited warranty and is not liable for any other costs other than those mentioned above, i.e. no consequential damages. Moreover, CTEK is not obligated to any other warranty other than this warranty.