How many Ah does the Bmw I3 Range Extender battery need?

The exact Ah rating for the Bmw I3 Range Extender depends on the vehicle's original electrical consumers. Compatible batteries offer 21-44 Ah, 340-420 A (CCA), 12 V, case H3/LN0, conventional flooded technology. Use our finder for a precise recommendation.

What type of battery does my car need?

You need the make, model and engine. If your car has Start-Stop (the engine switches off at traffic lights), it needs an EFB or an AGM battery, depending on what it came with: if it has an AGM, fit another AGM; if it has an EFB, another EFB or an AGM. On cars with battery management (BMW, Mercedes, VAG group…), moving from EFB to AGM requires coding the new battery. Without Start-Stop, a conventional battery is fine, or an EFB or AGM if you want a longer life.

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

A conventional (lead-acid) battery is for cars without Start-Stop. An EFB is a reinforced conventional battery for basic Start-Stop. An AGM offers the highest performance and is fitted as standard on cars with advanced Start-Stop, regenerative braking or high electrical demand. Replacement rule: an AGM only with another AGM; an EFB with another EFB or an AGM; a conventional battery with any of the three. Never move down in technology.

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.

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BMW i3 Range Extender

Batteries for BMW i3 Range Extender 102 hp

BMW · i3

Which battery does a BMW i3 Range Extender need?

Specifications and battery: Range Extender (102 hp)

BMW i3 Range Extender (102 hp) takes a conventional 44 Ah, 420 A battery (175 × 175 × 190 mm), with the positive terminal on the right. It does not need a Start-Stop battery, although an EFB or AGM of the same size also fits.

Battery for this engine

Version	Technology	Capacity	Cold cranking (EN)	Size (L×W×H)	Polarity
Main	Conventional	44 Ah	420 A	175 × 175 × 190 mm	+ on the right

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

🔧 Battery Expert Advisor

Battery analysis for your BMW i3 Range Extender

Quick answer You need an ordinary lead-acid battery of 44 Ah. Our recommendation: VARTA B36. This vehicle may use more than one auxiliary battery size. Check the size fitted on your car before buying.

Batteries in your BMW i3 Range Extender

Which battery do you want to replace?

MainOne optionSee all in the list →

Our recommendation

VARTA B36

ordinary lead-acid44 Ah420 A

175 × 175 × 190 mm

€44.80Buy

AuxiliaryOne optionSee all in the list →

Our recommendation

VARTA B36

ordinary lead-acid44 Ah420 A

175 × 175 × 190 mm

€44.80Buy

Prices and availability updated on 24/10/2026

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

📋 What we found

For your BMW i3 Range Extender we found 5 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 BMW i3 Range Extender we recommend the VARTA B36 (ordinary lead-acid, 44 Ah). It also delivers the most cranking power (CCA) on the list — a clear edge in cold starts. Varta is the world's leading manufacturer of starter batteries and supplies first-equipment (OEM) batteries to the major European car makers.

Rated 4.3/5 by 4 verified customers.
Get it on Tuesday before 5 PM — your product ships on Monday.
The best value price among compatible options.

See this battery →

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Verified selection

Class: Car Batteries
Brand: BMW
Model: i3
Engine: Range Extender

Order now with express shipping: your product ships on Monday and arrives on Tuesday before 5 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 — the same as your current battery or higher)
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.

5 products

Comparison table of available products
Category	Make	Reference	Capacity	Cold cranking	Dimensions	Technology	Price
Auxiliary Battery	VARTA	B36	44 Ah	420 A	175×175×190 mm	—	€44.80	More info
Auxiliary Battery	EXIDE	ETX24HL-BS	21 Ah	350 A	205×90×165 mm	AGM	€82.80	More info
Auxiliary Battery	TUDOR	TB440	44 Ah	400 A	175×175×190 mm	—	€47.30	More info
Auxiliary Battery	EXIDE	AGM12-23	21 Ah	350 A	205×90×165 mm	AGM	€91.30	More info
Auxiliary Battery	EXIDE	EB440	44 Ah	400 A	175×175×190 mm	—	€78.95	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

: BMW i3 Range Extender (102 hp) takes a conventional 44 Ah, 420 A battery (175 × 175 × 190 mm), with the positive terminal on the right. It does not need a Start-Stop battery, although an EFB or AGM of the same size also fits. Compatible batteries offer 21-44 Ah, 340-420 A (CCA), 12 V, case H3/LN0, conventional flooded technology. Browse the compatible battery list below.
: The exact Ah rating for the Bmw I3 Range Extender depends on the vehicle's original electrical consumers. Compatible batteries offer 21-44 Ah, 340-420 A (CCA), 12 V, case H3/LN0, conventional flooded technology. Use our finder for a precise recommendation.
: You need the make, model and engine. If your car has Start-Stop (the engine switches off at traffic lights), it needs an EFB or an AGM battery, depending on what it came with: if it has an AGM, fit another AGM; if it has an EFB, another EFB or an AGM. On cars with battery management (BMW, Mercedes, VAG group…), moving from EFB to AGM requires coding the new battery. Without Start-Stop, a conventional battery is fine, or an EFB or AGM if you want a longer life.
: A conventional (lead-acid) battery is for cars without Start-Stop. An EFB is a reinforced conventional battery for basic Start-Stop. An AGM offers the highest performance and is fitted as standard on cars with advanced Start-Stop, regenerative braking or high electrical demand. Replacement rule: an AGM only with another AGM; an EFB with another EFB or an AGM; a conventional battery with any of the three. Never move down in technology.
: 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 delivery takes 24-48 working hours if you order before 6:00 pm (Monday to Friday) and the battery is in stock; mainland Portugal takes 1 to 4 working days, the Balearic Islands 2 to 5 working days and other EU destinations 4 to 7 working days. Batteries are shipped fully charged and ready to install.

Guides

: This vehicle has no Start-Stop. According to the manufacturer, it does not need to be registered after the change.

Batteries for BMW i3 Range Extender 102 hp

Which battery does a BMW i3 Range Extender need?