Car Jump Starters

The complete guide to buying a car jump starter in 2026

A flat battery is still the single most common reason UK drivers call for roadside assistance, and a good lithium jump starter turns a two hour wait into a two minute fix. Modern packs are small enough to live in a glovebox yet powerful enough to crank a diesel van. This guide covers how to size one correctly, what the safety features actually do and how to keep the pack healthy between uses.

How lithium jump starters work

Traditional booster packs used heavy lead acid cells that lost charge quickly and needed constant topping up. Lithium jump starters use a compact high discharge cell that delivers a huge burst of current for a few seconds, which is all a starter motor needs. That means a unit weighing under a kilogram can start an engine that would once have needed a pack the size of a briefcase, and it holds usable charge for months on the shelf.

Choosing the right amp rating

Peak amps is the headline figure, but the important question is simply engine size and fuel type. Diesels need noticeably more current than petrol engines of the same capacity because compression ignition demands harder cranking. Buy with a little headroom rather than exactly at the limit, as cold weather reduces available output and a bigger pack will also give you more jump starts per charge.

• Up to 4 litre petrol. The NOCO GB20 at 500A or GB40 at 1000A suits most family cars and small vans.
• Up to 6 litre petrol, 3 litre diesel. Step up to the GB50 at 1500A or GBX45 at 1250A for reliable cold starts.
• Larger diesels and 4x4s. The GB70 at 2000A, GBX55 and GBX75 handle bigger commercial and off road engines.
• Trucks, plant and 24V. The GB150, GB250, GBX155 and 24V GB251 or GB500 cover fleet and agricultural use.

Safety features that matter

The reason lithium packs have replaced jump leads for most drivers is protection built into the clamps. Spark proof technology means nothing happens until the unit detects a correct connection, and reverse polarity protection stops damage if you cross the terminals. Look for a manual override too, because it lets you boost a battery that has dropped so low the pack cannot read it automatically.

Brand quality at a glance

• NOCO GB Boost series. The proven UltraSafe range covering 500A to 4000A for cars, vans and 4x4s.
• NOCO GBX Boost X series. Faster recharging packs with USB-C Power Delivery in and out for modern devices.
• NOCO Boost Max. Heavy duty GB250, GB251 and GB500 units built for commercial and 24V applications.
• Bass Junkies tested stock. Every unit checked and charged before dispatch by our Wolverhampton team.

Compatibility and fitting

A jump starter needs no installation, but a few accessories make it far more useful day to day. These are the parts our customers most often add to an order.

• X-Connect eyelet terminals. Fused M6 or M10 leads that stay bolted to the battery for one plug boosting.
• 12V plug adapters. Let you recharge the pack from a cigarette lighter socket while driving.
• Extension cables. Reach awkward battery locations in boots, under seats and in engine bays.
• Protective carry case. Keeps the unit and clamps together and undamaged in the boot.

Care, storage and getting the best life

Lithium packs self discharge slowly, but they are happiest kept between half and full charge. Top yours up every three months, avoid leaving it flat over winter and store it in the cabin rather than an unheated garage if you can. Recharge fully after any jump start so it is ready next time, and the cells will comfortably last several years of occasional use.

Why buy from Bass Junkies

Bass Junkies has supplied and fitted quality in car audio and 12V technology since 1995, and our Wolverhampton workshop is still the heart of the business. Our team tests, matches and dispatches every order by hand, so you get the right jump starter for your engine and straight advice the first time. For help choosing the correct option for your vehicle or setup, call our experts on 01902 863 005 or order online today with fast UK delivery.