Batteries for Royal Enfield Thunderbird Thunderbird 500 27 hp (petrol, from 2014)
Which battery does a Royal Enfield Thunderbird Thunderbird 500 need?
Specifications and battery: Thunderbird 500 (27 hp)
Royal Enfield Thunderbird Thunderbird 500 (27 hp, petrol, from 2014) takes a 18 Ah, 270 A AGM battery (150 × 87 × 161 mm), with the positive terminal on the left.
- Brand
-
Royal Enfield
- Model
- Thunderbird
- Built
- 03/2014 - 2026
- Fuel
- Petrol
- Cylinders
- 1
- Drive
- Chain
Battery for this engine
| Version | Technology | Capacity | Cold cranking (EN) | Size (L×W×H) | Polarity |
|---|---|---|---|---|---|
| Main | AGM | 18 Ah | 270 A | 150 × 87 × 161 mm | + on the left |
The same batteries also fit the Thunderbird 350 (20 hp) engine of this model.
Data: vehicle specifications and the battery manufacturer's application catalogue.
EFB, AGM or conventional for this engine?
Rule of thumb for the Royal Enfield Thunderbird Thunderbird 500: 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 18 Ah.
Battery analysis for your Royal Enfield Thunderbird Thunderbird 500
Quick answer You need an AGM battery of 18 Ah. Our recommendation: VARTA YTX20CH-BS.
Prices and availability updated on 30/10/2026
Based on the batteries we found for your vehicle, our experts help you pick the right one.
📋 What we found
For your Royal Enfield Thunderbird Thunderbird 500 we found 5 compatible AGM or EFB batteries.
📊 View AGM vs EFB vs Conventional — full comparison
⭐ Our recommendation
For your Royal Enfield Thunderbird Thunderbird 500 we recommend the VARTA YTX20CH-BS (AGM, 18 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.
- Get it on Monday before 5 PM — your product ships today.
- 22% cheaper than the most expensive option in the list.
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Verified selection
- Class: Motorcycle Batteries
- Brand: Royal Enfield
- Model: Thunderbird
- Engine: Thunderbird 500
AGM / EFB batteries
AGM or EFB technology batteries: more charge cycles, faster recovery and a longer life than a conventional battery.
Why we recommend the VARTA 518908027
For €37.50 more you get +55 A cold cranking and +4 Ah capacity.
| RecommendedVARTA 518908027 | CheapestEXIDE ETX16-BS | |
|---|---|---|
| Cold cranking | 270 A | 215 A |
| Capacity | 18 Ah | 14 Ah |
| Technology | AGM | AGM |
| Why | Varta brand | — |
| Price | €86.70 | €49.20 |
-
Motorcycle battery Varta YTX20CH-BS (518908027) 12V 18Ah 270A AGM
- 12 V
- 18 Ah
- 270 A
- AGM VARTA 518908027 · 18 Ah · 270 A
Dimensions 150×87×161 mm
- ✓ Varta brand
€86.70
-
Motorcycle battery Exide AGM12-16 12V 16Ah 200A AGM
- 12 V
- 16 Ah
- 200 A
- AGM EXIDE AGM12-16 · 16 Ah · 200 A
Dimensions 150×90×160 mm
€59.30
-
Motorcycle battery Exide ETX20CH-BS 12V 18Ah 230A AGM
- 12 V
- 18 Ah
- 230 A
- AGM EXIDE ETX20CH-BS · 18 Ah · 230 A
Dimensions 150×90×160 mm
€62.30
-
Motorcycle battery Exide ETX16-BS 12V 14Ah 215A AGM
- 12 V
- 14 Ah
- 215 A
- AGM EXIDE ETX16-BS · 14 Ah · 215 A
Dimensions 150×90×160 mm
€49.20
-
Motorcycle battery Varta YTX16-BS (514902022) 12V 14Ah 210A AGM
- 12 V
- 14 Ah
- 210 A
- AGM VARTA 514902021 · 14 Ah · 210 A
Dimensions 150×87×161 mm
€110.60
| Category | Make | Reference | Capacity | Cold cranking | Dimensions | Technology | Price | |
|---|---|---|---|---|---|---|---|---|
| AGM / EFB batteries | VARTA | 518908027 | 18 Ah | 270 A | 150×87×161 mm | AGM | €86.70 | More info |
| AGM / EFB batteries | EXIDE | AGM12-16 | 16 Ah | 200 A | 150×90×160 mm | AGM | €59.30 | More info |
| AGM / EFB batteries | EXIDE | ETX20CH-BS | 18 Ah | 230 A | 150×90×160 mm | AGM | €62.30 | More info |
| AGM / EFB batteries | EXIDE | ETX16-BS | 14 Ah | 215 A | 150×90×160 mm | AGM | €49.20 | More info |
| AGM / EFB batteries | VARTA | 514902021 | 14 Ah | 210 A | 150×87×161 mm | AGM | €110.60 | More info |
Frequently asked questions
- Royal Enfield Thunderbird Thunderbird 500 (27 hp, petrol, from 2014) takes a 18 Ah, 270 A AGM battery (150 × 87 × 161 mm), with the positive terminal on the left. We found 5 compatible batteries priced between 49,20€ — 110,60€. Check dimensions and positive terminal position before purchasing.
- Motorcycles can use GEL, AGM, or conventional batteries. GEL batteries are ideal for occasional use. AGM batteries are the best option for heavy use or high-power motorcycles. Always check the polarity before installation.
- Polarity indicates which side has the positive (+) terminal. This is critical for motorcycles because some models have the positive terminal on the left and others on the right. Check the label on your current battery or the manufacturer's manual.
- Yes. First disconnect the negative (−) wire and then the positive (+) wire. When installing the new one, connect the positive (+) wire first and then the negative (−) wire. Always respect the correct polarity.
- 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.