whats the difference between using this versus just extending the plug at the other end with a normal multiplug adapter/extension lead?

I use this Extension Cable because my Charger is inside the wall mounted Ctek Cage, which gives you the extra cable length. On a previous Car I ran a 240v Extension Reel into the Boot and connected with the standard Ctek Lead, the Boot Seal allowed for the thickness of the 240v Flex.

Is this compatible with the cs free charger to connect eyelets to the battery terminal? the only leads with the cs free are croc clips.

Hi there, I am afraid I cannot give you a 100% accurate answer. I don't know what the "cs free charger" is. I bought the CTEK battery charger and wanted the extension cable so that I could reach the car from a wall socket. My CTEK came with both a croc clips cable and an eyelets cable. Both of these short cables use the strangely shaped orange connector to connect the the CTEK. Therefore if you have the CTEK you can use either the eyelets or croc clips cable. I actually got my garage to fit the eyelet cable to the battery (mainly because my car has the battery underneath a cowling in the engine compartment and it is very awkward to get at the battery terminals). The car was being serviced and my garage didn't even charge me to fix the eyelets to the battery and they strapped the strange orange connector plug to some pipework under the car bonnet. It works great and with the extension lead I just raise the bonnet and hook up the CTEK within a couple of minutes. The CTEK has been a life saver for me. My car doesn't get used a great deal and I can now keep the battery topped up all the time (usually I hook up the CTEK about once every 8-9 days. I know that's not a direct answer but if you do own the CTEK charger you can use this extension cable and choose either the croc clips or eyelets cable that comes with the CTEK. Without the CTEK charger and the unique orange connector plug that is fitted on the cable that comes out of the charger then this extension cable would not be compatible (unless you can get the unique orange connector with other chargers but I haven't seen any, I think it's a custom CTEK fitting). Hope that helps.

is this product waterproof?

I would say its more water resistant when connected rather than waterproof. I have used mine many times over past 5 years outside and its been fine. I cover the connector and keep it off the ground with a small plastic box or plant pot and them cover box with another bigger box. Also means people wont trip over it.

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Reseñas

G**S

Works well and of a useful length

Provided enough extra cable length to enable me to connect my car battery to my CTEK charger mounted on the wall inside my garage near to the up and over door sufficient for me to also be able to close the garage door with car outside. Useful to have and appears well made like my trusty CTEK charger.

21.12.2025

D**S

Good but rather rigid lead

Does the job, as it avoids having to have the charger inbthe engine bay. But the quality of the lead itself is disappointing; for the price I expected the lead to be a lot more flexible.

17.02.2026

J**J

Ctek 2.5mtr extension lead

This Ctek extension is a must if you do not not want to leave your Ctek battery charger under the bonnet when charging or you do not have close access to a mains socket, as the cable supplied with these Ctek chargers is not very long. The extension is well made and has comfort plug push in connections to your Ctek charger cable. Expensive for what it is.

10.12.2025

B**.

Good but would like a waterproof cover on the female end

Good works well however bit disappointed that the female end doesn’t have the Ctek waterproof cover on it. Other than that it works great

16.01.2026

A**R

Easy to connect up

Easy to connect up and enables charger to be kept under cove while charging.

20.02.2026

L**N

CTEK Extension Cable

Item as described,good quality and fast delivery.

13.01.2026

R**B

Good extension cable with weatherproof seals.

Very good extension between the car and charger. The connectors have seals so the cable can be used safely outdoors in all weathers. Only one criticism, the cable is very stiff to store away. It feels like it has single core wires instead of more flexible multi-strand wires.

13.09.2025

M**.

Neat addition to regularly using the charger

Has allowed me to fit the charger into a CTEK holder bracket on the wall, making the system neater. Middle connector (nearest charger) does get quite warm, but no problems charging so far.

4.11.2025

ASIN	B00ADIHUVG
Best Sellers Rank	769 in Automotive ( See Top 100 in Automotive ) 17 in Car Battery Charging Units
Brand	CTEK
Cable Type	Component
Cable type	Component
Colour	Black
Compatible Devices	CTEK chargers (up to 10A)
Compatible Phone Models	No Compatible Phone Models
Compatible devices	CTEK chargers (up to 10A)
Compatible phone models	No Compatible Phone Models
Connector Gender	Male-to-Male
Connector Type	CTEK Connector
Connector type	CTEK Connector
Country Of Origin	China
Customer Package Type	Standard Packaging
Customer Reviews	4.7 out of 5 stars 8,539 Reviews
Global Trade Identification Number	07350009563048
Included Components	CTEK 56-304
Indoor Outdoor Usage	Outdoor
Item Length	2.5 Metres
Item Type Name	Accessories
Item Weight	0.26 Pounds
Manufacturer	C-Tek
Maximum Current	10 Amps
Maximum Voltage	12 Volts (DC)
Model Name	CTEK 56-304
Model Number	56-304
Number of Items	1
Number of Pins	4
Other Special Features of the Product	Waterproof
Product Warranty	2 years
Recommended Uses For Product	Extend the range of car battery chargers
Special feature	Waterproof
Specification Met	CE
Unit Count	1 Count
Wattage	1000 watts

CTEK 56-304 Connect 2.5M Extension: extend the range of your charger

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