Can I install a higher capacity battery in my Caterham 21 2.0?

Yes, you can install a higher capacity (Ah) battery as long as the physical dimensions fit your Caterham 21 2.0 battery compartment and the positive terminal position matches.

What battery fits the Caterham 21 2.0?

The Caterham 21 2.0 requires a battery with the correct capacity (Ah) and Cold Cranking Amps (CCA) for this engine. Compatible batteries offer 24-30 Ah, 200-300 A (CCA), 12 V, case 12N24-4, conventional flooded technology. Browse the compatible battery list below.

How many Ah does the Caterham 21 2.0 battery need?

The exact Ah rating for the Caterham 21 2.0 depends on the vehicle's original electrical consumers. Compatible batteries offer 24-30 Ah, 200-300 A (CCA), 12 V, case 12N24-4, conventional flooded technology. Use our finder for a precise recommendation.

How long does a battery last in a Caterham 21 2.0?

With normal use, a battery for the Caterham 21 2.0 lasts 3–5 years. A healthy alternator and avoiding deep discharges significantly extend battery life.

What type of battery does my car need?

To find the exact battery you need, you need to know the make, model, and engine. If your car has a Start-Stop system (the engine shuts off at traffic lights), you need an AGM or EFB battery. An AGM battery can only be replaced with another AGM battery. However, an EFB battery can be replaced with either another EFB or an AGM battery, as the latter is superior.

What is the difference between AGM, EFB and standard batteries?

The standard battery is the conventional type. The EFB battery withstands start/stop cycles better. The AGM battery is the most durable and is mandatory in cars with Start-Stop and regenerative braking. Never replace an AGM battery with an EFB or standard battery.

How do I find the right battery for my vehicle?

Use the search tool by selecting your vehicle's make and model. Our system automatically filters compatible part numbers verified by our technicians. If you have any questions, contact us via WhatsApp.

What warranty do the batteries have?

All our batteries come with the legal guarantee provided by consumer law against manufacturing defects. If a battery has a manufacturing defect, it will be replaced at no cost to the user.

How long does it take for the battery to arrive?

Under normal circumstances, batteries usually arrive within 1 to 2 days of ordering. However, there are some cases where delivery may take a little longer: peak seasons (Black Friday, Christmas, etc.), palletized shipments, occasional stock shortages, etc.

12,113 customer reviewsThank you for trusting usThank you! Excellent 4.5 out of 5

Caterham 21 2.0

Batteries for Caterham 21 2.0 175 hp (petrol, 1996-2002)

Caterham · 21

Which battery does a Caterham 21 2.0 need?

Specifications and battery: 2.0 (175 hp)

Caterham 21 2.0 (175 hp, petrol, 1996-2002) takes a conventional 30 Ah, 300 A battery (186 × 130 × 171 mm).

Brand: Caterham
Model: 21 (C2)
Built: 10/1996 - 2002
Power: 129 kW / 175 hp
Fuel: Petrol
Engine size: 1,998 cc (2 L)
Cylinders: 4
Body type: Convertible
Drive: Rear-Wheel Drive

Battery for this engine

Version	Technology	Capacity	Cold cranking (EN)	Size (L×W×H)	Polarity
Main	Conventional	30 Ah	300 A	186 × 130 × 171 mm	—

This engine shares its battery with the 1.6 i (117 hp), 1.6 i (133 hp), 1.6 i Supersport (140 hp), 1.8 (140 hp) and 6 more: the compatible batteries are exactly the same.

Data: vehicle specifications and the battery manufacturer's application catalogue.

🔧 Battery Expert Advisor

Battery analysis for your Caterham 21 2.0

Quick answer You need an Lead-acid battery of 30 Ah. Our recommendation: VARTA 530034030. This vehicle may use more than one auxiliary battery size. Check the size fitted on your car before buying.

Batteries in your Caterham 21 2.0

Which battery do you want to replace?

MainOne optionSee all in the list →

Our recommendation

VARTA 530034030

Lead-acid30 Ah300 A

186 × 130 × 171 mm

€186.30Buy

AuxiliaryOne optionSee all in the list →

Our recommendation

VARTA 530034030

Lead-acid30 Ah300 A

186 × 130 × 171 mm

€186.30Buy

Prices and availability updated on 20/10/2026

Based on the batteries we found for your vehicle, our experts help you pick the right one.

📋 What we found

For your Caterham 21 2.0 we found 2 compatible auxiliary batteries.

⚡ Starter or auxiliary battery

We detected an auxiliary battery among the compatible ones. The auxiliary is NOT your main car battery: it is a smaller secondary battery that powers sensitive electronics. Don't mix them up when buying.

⭐ Our recommendation

Our recommendation

For your Caterham 21 2.0 we recommend the VARTA 530034030 (Lead-acid, 30 Ah). It also offers the highest capacity (Ah) and the highest cranking power (CCA) on the list — more headroom in cold starts and with many consumers. Varta is the world's leading manufacturer of starter batteries and supplies first-equipment (OEM) batteries to the major European car makers.

Next-day delivery if you order before 6 PM.

See this battery →

Was this advisor helpful?

Verified selection

Class: Car Batteries
Brand: Caterham
Model: 21
Engine: 2.0

Order now with express shipping: your product ships tomorrow and arrives on Thursday before 2 PM (Spain mainland and Portugal only).

Before you buy: check 3 key points

Although the batteries shown are sourced from information provided by manufacturers, we recommend checking on your current battery:

Dimensions (length × width × height, including terminals and protrusions)
The dimensions shown are the maximum of the battery and include the height of the terminals, small ridges at the base and any lateral protrusions. Measure your current battery completely, from edge to edge. The new one must be the same size or slightly smaller — never larger, it would not fit in the housing.
Positive terminal (left or right viewed from the front — check the battery photo carefully)
Stand facing the battery, with the manufacturer's label facing you and the terminals on top. Locate the terminal marked with +: if it is on your right, it is "positive right"; if it is on your left, it is "positive left". Do not rely on how the battery is mounted in the car — the position is always measured looking only at the battery itself.
Technology (AGM, EFB or conventional — Start-Stop requires AGM or EFB)
Depending on the manufacturer, the same technology may be labelled differently: AGM may also appear as VRLA, AGM Start-Stop or AGM Deep Cycle. EFB may appear as EF, EFB+ or Enhanced Flooded Battery. Conventional may appear as SLI, Lead-Acid, Wet or Standard. If your vehicle has Start-Stop, the battery must be AGM or EFB — never conventional.

If you have any questions, just ask us and we'll be glad to advise you with no obligation.

Auxiliary Battery

Auxiliary battery for vehicles equipped with start-stop systems. It supports the main battery in functions such as engine start, the start-stop system, or additional electrical support.

2 products

Why we recommend the VARTA 530034030

For €23.10 more you get +100 A cold cranking and +6 Ah capacity.

	RecommendedVARTA 530034030	CheapestVARTA 524101020
Cold cranking	300 A	200 A
Capacity	30 Ah	24 Ah
Why	Varta brand	—
Price	€186.30	€163.20

View VARTA 530034030

Comparison table of available products
Category	Make	Reference	Capacity	Cold cranking	Dimensions	Price
Auxiliary Battery	VARTA	530034030	30 Ah	300 A	186×130×171 mm	€186.30	More info
Auxiliary Battery	VARTA	524101020	24 Ah	200 A	186×125×178 mm	€163.20	More info

Complete your purchase

Chargers

Chargers for your battery

1 product

Battery charger ABSAAR Pro4.0 6/12V 4A Smart Charger
- 6 V
€50.60

Frequently asked questions

: Yes, you can install a higher capacity (Ah) battery as long as the physical dimensions fit your Caterham 21 2.0 battery compartment and the positive terminal position matches.
: The Caterham 21 2.0 requires a battery with the correct capacity (Ah) and Cold Cranking Amps (CCA) for this engine. Compatible batteries offer 24-30 Ah, 200-300 A (CCA), 12 V, case 12N24-4, conventional flooded technology. Browse the compatible battery list below.
: The exact Ah rating for the Caterham 21 2.0 depends on the vehicle's original electrical consumers. Compatible batteries offer 24-30 Ah, 200-300 A (CCA), 12 V, case 12N24-4, conventional flooded technology. Use our finder for a precise recommendation.
: With normal use, a battery for the Caterham 21 2.0 lasts 3–5 years. A healthy alternator and avoiding deep discharges significantly extend battery life.
: To find the exact battery you need, you need to know the make, model, and engine. If your car has a Start-Stop system (the engine shuts off at traffic lights), you need an AGM or EFB battery. An AGM battery can only be replaced with another AGM battery. However, an EFB battery can be replaced with either another EFB or an AGM battery, as the latter is superior.
: The standard battery is the conventional type. The EFB battery withstands start/stop cycles better. The AGM battery is the most durable and is mandatory in cars with Start-Stop and regenerative braking. Never replace an AGM battery with an EFB or standard battery.
: Use the search tool by selecting your vehicle's make and model. Our system automatically filters compatible part numbers verified by our technicians. If you have any questions, contact us via WhatsApp.
: All our batteries come with the legal guarantee provided by consumer law against manufacturing defects. If a battery has a manufacturing defect, it will be replaced at no cost to the user.
: Under normal circumstances, batteries usually arrive within 1 to 2 days of ordering. However, there are some cases where delivery may take a little longer: peak seasons (Black Friday, Christmas, etc.), palletized shipments, occasional stock shortages, etc.
: In mainland Spain and Portugal delivery takes 24 working hours if you order before 6:00 pm and the battery is in stock; for the Balearic Islands and other EU destinations allow 2 to 5 days. Batteries are shipped fully charged and ready to install.

Guides

: This vehicle uses a conventional flooded battery: no BMS registration is required, the alternator will charge it directly.

Batteries for Caterham 21 2.0 175 hp (petrol, 1996-2002)

Which battery does a Caterham 21 2.0 need?