Batteries for BMW i3 s Range Extender 184 hp (petrol hybrid, from 2017)
Which battery does a BMW i3 s Range Extender need?
Specifications and battery: s Range Extender (184 hp)
BMW i3 s Range Extender (184 hp, petrol hybrid, from 2017) takes a 21 Ah, 350 A AGM battery (205 × 90 × 165 mm), with the positive terminal on the right. (W20K06A, IB1P25B)
- Brand
-
BMW
- Model
-
i3 (I01)
- Built
- 11/2017 - 2026
- Power
- 135 kW / 184 hp
- Fuel
- Petrol/Electric
- Engine size
- 647 cc (0.7 L)
- Cylinders
- 2
- Body type
- Hatchback
- Drive
- Rear-Wheel Drive
- Engine codes
- W20K06A, IB1P25B
Battery for this engine
| Version | Technology | Capacity | Cold cranking (EN) | Size (L×W×H) | Polarity |
|---|---|---|---|---|---|
| Main | AGM | 21 Ah | 350 A | 205 × 90 × 165 mm | + on the right |
This engine shares its battery with the Electric (170 hp), Electric (102 hp), s Electric (184 hp), s Electric (102 hp) and 1 more: the compatible batteries are exactly the same.
Data: vehicle specifications and the battery manufacturer's application catalogue.
EFB, AGM or conventional for this engine?
Rule of thumb for the BMW i3 s Range Extender: fit the same technology as the original or better (conventional → EFB → AGM), with equal or higher capacity and cold cranking amps, and respect the size and terminal position of around 21 Ah.
Battery analysis for your BMW i3 s Range Extender
Quick answer You need an AGM battery of 21 Ah. Our recommendation: EXIDE ETX24HL-BS.
Batteries in your BMW i3 s Range Extender
Prices and availability updated on 09/11/2026
Based on the batteries we found for your vehicle, our experts help you pick the right one.
📋 What we found
For your BMW i3 s Range Extender 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
For your BMW i3 s Range Extender we recommend the EXIDE ETX24HL-BS (AGM, 21 Ah). It's one of the most installed references on this type of vehicle.
- Get it tomorrow if you order before 6 PM.
- The best value price among compatible options.
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Verified selection
- Class: Car Batteries
- Brand: BMW
- Model: i3
- Engine: s Range Extender
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.
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Chargers
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Frequently asked questions
- BMW i3 s Range Extender (184 hp, petrol hybrid, from 2017) takes a 21 Ah, 350 A AGM battery (205 × 90 × 165 mm), with the positive terminal on the right. Compatible batteries offer 21 Ah, 340 A (CCA), 12 V, case TX24HL-BS, conventional flooded technology. Browse the compatible battery list below.
- If your Bmw I3 S Range Extender has start-stop, regenerative braking or many electrical accessories, you will need an AGM or EFB battery. Check your vehicle's technical specifications.
- 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
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This vehicle has no Start-Stop. According to the manufacturer, it does not need to be registered after the change.