#1Clarke JS1200
Best OverallPeak Amps1200A
Weight1.2 kg
USB Output2.1A
Warranty2 Years
Pros
- Strong 1200A peak for most cars
- Compact and lightweight design
- Includes USB charging for devices
Cons
- Not suitable for large diesel vans
- No built-in air compressor
The Clarke JS1200 is the sweet spot in the range. It provides 1200 peak amps, enough to start a 5.0L petrol or 3.0L diesel engine. Owner reviews consistently praise its reliability and build quality, with many noting it starts cars instantly even in cold weather.
The unit is compact enough to store in a glovebox or boot. It features a bright LED light and a USB port for charging phones. For the home mechanic with a standard car or small van, this is the most practical choice.
Expert take: The JS1200 offers the best power-to-portability ratio in Clarke's lineup, making it the top pick for most drivers.
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#2Clarke PRO170
Best Heavy DutyPeak Amps1700A
Weight2.0 kg
Engine (Diesel)Up to 5.0L
Warranty2 Years
Pros
- Very high 1700A peak power
- Starts large diesel engines easily
- Rugged construction for workshop use
Cons
- Heavier and bulkier than JS1200
- Higher price point
The PRO170 is Clarke's most powerful portable jump starter. With 1700 peak amps, it can handle up to 7.0L petrol and 5.0L diesel engines, making it ideal for vans, trucks, and agricultural equipment. Owners report it starts even stubborn engines without hesitation.
It comes with heavy-duty clamps and a robust carry case. The unit is heavier, but that is expected for the power it delivers. If you work with larger vehicles regularly, the PRO170 is the most capable option.
Expert take: For commercial users and those with large diesel engines, the PRO170 provides the necessary reserve power and durability.
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#4Clarke JS500
Best for Small EnginesPeak Amps500A
Weight0.6 kg
Engine (Petrol)Up to 2.0L
USB Output1A
Pros
- Very compact and lightweight
- Lowest price in the range
- Good for motorcycles and lawnmowers
Cons
- Limited to small engines only
- Not suitable for larger cars or vans
The JS500 is the entry-level model, designed for small engines like those in motorcycles, lawnmowers, and compact cars. With 500 peak amps, it can start 2.0L petrol and 1.5L diesel engines. Owners find it useful as a lightweight emergency tool.
Its small size makes it the most portable option. However, it lacks the power for larger vehicles. It is best kept as a backup for small engines or for those who only drive a compact car.
Expert take: The JS500 is a niche product best suited for small engines, but most users will find the JS800 offers better value.
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What to Check Before Buying a Jump Starter
Before choosing a Clarke jump starter, consider the engine size of your vehicle. Peak amps determine the starting power: 500A for small engines, 800-1200A for most cars, and 1700A for large diesels. Always choose a model with a safety margin above your engine's requirements.
Check the battery capacity (Ah) as it affects how many jumps you get per charge. Look for safety features like reverse polarity protection and spark-proof technology. Also consider extra features like USB ports, LED lights, and the quality of the carry case.
Mistakes to Avoid
Do not buy a jump starter with insufficient peak amps for your vehicle. A unit that is too weak may fail to start the engine and could be damaged. Always match the peak amps to your engine size, especially for diesel engines which require more power.
Avoid neglecting to recharge the unit. Lithium batteries lose charge over time, so check and recharge every 3-6 months. Also, do not use the jump starter as a regular power bank for extended periods, as this drains the starting reserve.
Who Are Clarke Jump Starters For?
Clarke jump starters are for home mechanics, professional drivers, and anyone who wants a reliable backup for a dead battery. The range covers from small car owners to commercial users with large vans and trucks. They are a good choice for those who prefer a no-frills, robust tool from a trusted UK brand.
Performance and Reliability
Based on published specs and aggregated owner reviews from retailers like Amazon and Toolstation, Clarke jump starters perform consistently well. The JS1200 and PRO170 models receive high marks for starting power and build quality. Some users note that the cheaper JS500 can struggle with larger engines, but this is expected given its lower specs.
Battery life is generally good, with most units holding a charge for several months. The safety features, including reverse polarity alarms and overcharge protection, are appreciated by users. Clarke offers a 2-year warranty on most models, which adds peace of mind.
Build Quality and Design
Clarke jump starters are built with a rugged plastic casing that can withstand workshop conditions. The clamps are well-made and provide a strong connection. The units are compact, with the JS1200 being particularly easy to store. The PRO170 is larger but still manageable for its power class.
The design is functional rather than flashy. Controls are simple, with clear LED indicators for battery status. The included carry cases are of decent quality. Overall, the build quality matches the price point, offering good durability for the money.
Alternatives to Clarke
If Clarke is not available, consider brands like Sealey, which offers similar professional-grade jump starters. Sealey models often have comparable specs and are also popular in the UK. For a more budget-friendly option, look at Draper or Stanley, though they may not have the same power output or build quality.
For those who want a multi-function device, some jump starters include air compressors and inverters. However, Clarke focuses on pure starting power, which often results in more reliable performance for that specific task. If you need an all-in-one tool, other brands may be a better fit.
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