Batteries for REX Monaco Monaco 50 4 hp (petrol, from 2011)
Which battery does a REX Monaco Monaco 50 need?
Specifications and battery: Monaco 50 (4 hp)
REX Monaco Monaco 50 (4 hp, petrol, from 2011) takes a 8 Ah, 105 A AGM battery (150 × 87 × 93 mm), with the positive terminal on the left.
- Brand
-
REX
- Model
- Monaco
- Built
- 03/2011 - 2026
- Fuel
- Petrol
- Cylinders
- 1
- Drive
- Vario
Battery for this engine
| Version | Technology | Capacity | Cold cranking (EN) | Size (L×W×H) | Polarity |
|---|---|---|---|---|---|
| Main | AGM | 8 Ah | 105 A | 150 × 87 × 93 mm | + on the left |
This engine shares its battery with the Monaco 125 (8 hp): the compatible batteries are exactly the same.
Data: vehicle specifications and the battery manufacturer's application catalogue.
Battery analysis for your REX Monaco Monaco 50
Quick answer You need an AGM battery of 8 Ah. Our recommendation: VARTA 508901015.
Prices and availability updated on 19/10/2026
Based on the batteries we found for your vehicle, our experts help you pick the right one.
📋 What we found
For your REX Monaco Monaco 50 we found 6 compatible Start-Stop batteries.
📏 Battery size
The list contains batteries in different sizes or capacities (Ah). In many cases both variants fit, but it's worth checking your compartment dimensions and the Ah of your original battery before buying. Choose the one with the same dimensions as your current battery: a bigger one may not fit the compartment or the hold-down. If several match your size, the higher capacity gives more headroom for cold starts.
⚡ Battery type for your vehicle
✓ Your REX Monaco Monaco 50 uses the Start-Stop system. Every battery shown is compatible — no conventional options to confuse you.
🔋 Technology (AGM / EFB)
✓ All Start-Stop batteries in the list are AGM — the most advanced technology. Perfect if your current battery was AGM or EFB: AGM always replaces both. Remember to register it via OBD if your car has a BMS (BMW, Audi, VAG, Mercedes…) so the alternator charges it correctly.
📊 View AGM vs EFB vs Conventional — full comparison
⭐ Our recommendation
For your REX Monaco Monaco 50 we recommend the VARTA 508901015 (AGM, 8 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.
- Next-day delivery if you order before 6 PM.
- 19% cheaper than the most expensive option in the list.
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Verified selection
- Class: Motorcycle Batteries
- Brand: REX
- Model: Monaco
- Engine: Monaco 50
Start-Stop & high energy demand batteries
AGM or EFB battery for start-stop vehicles and for cars with high energy demand (many electrical consumers, frequent starts). More charge cycles, better charge recovery and longer service life.
This engine comes with an AGM/EFB battery as standard: the car's charging system requires it even without Start-Stop. If in doubt, message us and we will confirm.
Why we recommend the VARTA 508901015
For €16.20 more you get +60 A cold cranking and +2 Ah capacity.
| RecommendedVARTA 508901015 | CheapestEXIDE ETX7A-BS | |
|---|---|---|
| Cold cranking | 150 A | 90 A |
| Capacity | 8 Ah | 6 Ah |
| Technology | AGM | AGM |
| Why | Varta brand | — |
| Price | €39.10 | €22.90 |
-
Motorcycle battery Varta TTZ10S-BS (508901015) 12V 8Ah 150A AGM
- 12 V
- 8 Ah
- 150 A
- AGM VARTA 508901015 · 8 Ah · 150 A
Dimensions 150×87×93 mm
- ✓ Varta brand
€39.10
-
Motorcycle battery Exide ETX7A-BS 12V 6Ah 90A AGM
- 12 V
- 6 Ah
- 90 A
- AGM EXIDE ETX7A-BS · 6 Ah · 90 A
Dimensions 150×90×95 mm
€22.90
-
Motorcycle battery Varta YTX7A-BS (506015005) 12V 6Ah 105A AGM
- 12 V
- 6 Ah
- 105 A
- AGM VARTA 506015011 · 6 Ah · 105 A
Dimensions 151×88×94 mm
€33.30
-
Motorcycle battery Exide ETZ10-BS 12V 9Ah 145A AGM
- 12 V
- 9 Ah
- 145 A
- AGM EXIDE ETZ10-BS · 9 Ah · 145 A
Dimensions 150×90×95 mm
€34.10
-
Motorcycle battery Exide AGM12-8 12V 8.6Ah 145A AGM
- 12 V
- 8.60 Ah
- 145 A
- AGM EXIDE AGM12-8 · 8.60 Ah · 145 A
Dimensions 150×90×95 mm
€48.20
-
Motorcycle battery Exide AGM12-6 12V 6Ah 90A AGM
- 12 V
- 6 Ah
- 90 A
- AGM EXIDE AGM12-6 · 6 Ah · 90 A
Dimensions 150×90×95 mm
€46.70
| Category | Make | Reference | Capacity | Cold cranking | Dimensions | Technology | Price | |
|---|---|---|---|---|---|---|---|---|
| Start-Stop & high energy demand batteries | VARTA | 508901015 | 8 Ah | 150 A | 150×87×93 mm | AGM | €39.10 | More info |
| Start-Stop & high energy demand batteries | EXIDE | ETX7A-BS | 6 Ah | 90 A | 150×90×95 mm | AGM | €22.90 | More info |
| Start-Stop & high energy demand batteries | VARTA | 506015011 | 6 Ah | 105 A | 151×88×94 mm | AGM | €33.30 | More info |
| Start-Stop & high energy demand batteries | EXIDE | ETZ10-BS | 9 Ah | 145 A | 150×90×95 mm | AGM | €34.10 | More info |
| Start-Stop & high energy demand batteries | EXIDE | AGM12-8 | 8.60 Ah | 145 A | 150×90×95 mm | AGM | €48.20 | More info |
| Start-Stop & high energy demand batteries | EXIDE | AGM12-6 | 6 Ah | 90 A | 150×90×95 mm | AGM | €46.70 | More info |
Frequently asked questions
- REX Monaco Monaco 50 (4 hp, petrol, from 2011) takes a 8 Ah, 105 A AGM battery (150 × 87 × 93 mm), with the positive terminal on the left. We found 6 compatible batteries priced between 22,90€ — 48,20€. Check dimensions and positive terminal position before purchasing.
- Yes, you can install a higher capacity (Ah) battery as long as the physical dimensions fit your REX Monaco Monaco 50 battery compartment and the positive terminal position matches.
- Yes, we detected Start-Stop compatible batteries for your REX Monaco Monaco 50. If your vehicle has Start-Stop, it needs an AGM or EFB battery. An AGM must always be replaced with AGM. An EFB can be replaced with EFB or AGM. Never install a conventional battery in a Start-Stop vehicle.
- 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.