Part no. 40-315


Technical data

Battery capacity
40–300 Ah
Charging category
DC charging
Back current drain*
Corresponding to less than 1 Ah/month
Battery voltage
12 V
Battery chemistry
Lead acid; Lithium-ion
Ambient operating temperature
-20 ˚C to +50 ˚C (- 4 °F to +122 °F)
11.5–23 V, 25 A
14.4/14.7 V, 20 A, lead-acid battery types. 14.2 V, 20 A, LiFePO₄.
Less than 4 %
Battery types
12 V:; WET; MF; Ca/Ca; AGM; EFB; GEL; LiFePO₄
Degree of protection
Gross weight (unit in box)
0.9 kg
Dimensions (L x W x H)
192 x 110 x 65 mm
Net weight (unit with cables)
0.7 kg
2 years
Warranty, info
Limited Warranty
*) 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.