Do You Need a Cable for a Tethered Charger?

For everyday charging at home, no: a tethered charger has the cable permanently attached, so you simply plug the built-in connector into your car and go. You do not buy a separate lead for home use. The one situation where a spare cable helps is out and about: many public and workplace points are untethered and expect you to bring your own Type 2 lead. So a tethered wallbox covers home charging on its own, but keeping a spare Type 2 cable in the boot means you can also use those bring-your-own public points.

At a glance: cable needs with a tethered charger

Why does a tethered charger not need a separate cable?

A tethered charger comes with the charging lead built into the unit, chosen and fitted when you order. The connector on the end matches your car's inlet, so charging is grab-and-go: unwind the attached cable, plug into your car, done. That is the main appeal of tethered, no loose lead to fetch, plug at both ends and coil away. Because the cable is part of the charger, there is nothing extra to buy for daily home charging, and nothing separate to store.

When would you still want a spare cable?

You want a spare when you charge away from home at untethered points. Plenty of car park, supermarket and on-street chargers are untethered, meaning they have a socket and expect you to bring your own Type 2 to Type 2 lead. Without one you cannot use them. A spare also lets you charge at a friend's untethered home unit. It is a cheap insurance policy: one good Type 2 lead in the boot opens up a large slice of the public network your tethered home charger cannot reach.

Do I need a cable for rapid public chargers?

No. Rapid DC chargers, the fast units at motorway services and forecourts, are always tethered with the cable built in. You never bring your own cable for those: you take the attached CCS or CHAdeMO connector and plug it straight into your car. A spare Type 2 lead is only for slower AC points that are untethered. So your kit for public charging is one Type 2 cable for untethered AC points, and nothing at all for rapid DC.

What spare cable should I keep in the boot?

Keep a Type 2 to Type 2 lead, since that fits almost every EV sold since 2018 and every untethered public AC point. A 5m length covers most public bays, though 7m gives extra reach where the socket is awkwardly placed. Match the current rating to what you might use: a 32A cable handles 7.4kW single-phase points, which is the majority. If your car is an older Type 1 model, your car end needs to be Type 1 instead, so buy a Type 2 to Type 1 lead.

Is a portable granny charger worth carrying too?

It can be, as a backup. A portable granny charger plugs into a normal 3-pin socket and adds roughly 8 to 10 miles of range per hour, so it is slow but useful when there is no proper charger available, such as at a holiday cottage. Plug it directly into a wall socket on its own circuit, never through an extension lead, multi-way adapter or smart plug, because of the fire risk. It is a backup, not a replacement for your tethered home charger.

Frequently asked questions

Does a tethered charger come with a cable?

Yes. A tethered charger has the charging lead permanently attached, chosen and fitted when you order, with a connector that matches your car. That is the point of tethered: grab-and-go home charging with nothing extra to buy or store. You only need a separate cable if you also want to use untethered public points away from home.

Do I need to buy a cable if I have a tethered wallbox?

Not for home charging, because the cable is attached. The only reason to buy one is a spare Type 2 lead for untethered public or workplace points, which expect you to bring your own. It is optional but handy, as it lets you use chargers your tethered home unit cannot reach when you are out and about.

Can I use a tethered home charger at public stations?

No, the tethered cable stays with your home unit. At public stations you either use a rapid DC charger, which has its own attached cable, or an untethered AC point, which needs you to bring a Type 2 lead. So carrying a spare Type 2 cable is the way to cover untethered public AC charging.

What length spare cable should I keep?

A 5m Type 2 to Type 2 lead suits most public bays. Choose 7m if you often meet awkwardly placed sockets or park further from the post. Match the current rating to what you use, a 32A cable covers the common 7.4kW single-phase points. Keep it coiled in the boot so it is always ready.

Do rapid chargers need my own cable?

No. Rapid DC chargers are always tethered with the cable built in, so you take the attached connector and plug it into your car. You never supply a cable for rapid charging. A spare lead is only for untethered AC points, which are the slower charging bays common at car parks and supermarkets.

Should I carry a portable granny charger as well?

As an occasional backup, yes. It plugs into a 3-pin socket and adds roughly 8 to 10 miles per hour, useful where no proper charger exists. Always plug it directly into a wall socket on its own circuit, never via an extension lead, adapter or smart plug. It is a slow backup, not a substitute for your tethered home charger.

A tethered charger keeps home charging effortless, but a single spare lead unlocks the untethered public network too. To weigh up the two home setups before you fit one, read our guide on tethered vs untethered wallboxes, and to decide whether that spare lead earns its place see is it worth buying a spare EV cable. When you want one for the boot, browse our Type 2 charging cables by length and power.