I1225 UK

The I1225 offers efficient and fast charging and is ideal charging and maintenance charging of 12V vehicles and machinery.

Part no. 40-191


12V | 25A charger with temperature regulation, for permanent installation.

The I1225 fully automatic 7 step charger delivers 25A to 12V batteries from 40-500Ah and is IP44 classified for outdoor use. It features automatic battery diagnosis to establish whether your battery can receive and retain a charge, unique maintenance charging and a temperature sensor for optimised charging regardless of weather conditions. The I1225 comes with 2 m cable with M10 eyelets for easy installation.


  • Fully automatic ‘connect and forget’ 7 step charging
  • Easy to read LED display
  • IP44 classified for outdoor use
  • Safe spark free operation
  • 2-year warranty

Technical data

170–260 VAC, 50–60 Hz, 2.9 A
14.4 V, 25 A
Battery capacity
40–500 Ah
Charging category
AC charging
Back current drain*
Corresponding to less than 2 Ah/month
Battery voltage
12 V
Battery chemistry
Lead acid
Ambient operating temperature
-20 ˚C to +50 ˚C
Less than 4 %
Battery types
12 V:; WET; MF; Ca/Ca; AGM; EFB; GEL
Degree of protection
Gross weight (unit in box)
2.1 kg
Dimensions (L x W x H)
235 x 130 x 65 mm
Charging cable length (output)
2 m
Net weight (unit with cables)
1.7 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.