# 18Ah batteries

We stock 20 batteries of 18 Ah (AGM, lead-acid) priced between 48.61 € and 172.09 €, VAT included. Amp-hour capacity is the total energy the battery stores: when replacing, always fit equal or slightly higher capacity than the original, never lower.

A 18Ah battery belongs to the small segment: motorcycles, scooters, quads, jet skis, UPS and electronics. Compact format and vibration resistance rule here; always check terminal layout before buying.

At this rating we stock AGM, lead-acid. Start-Stop golden rule: never downgrade technology — factory AGM must be replaced with AGM; factory EFB can be upgraded to AGM but never downgraded to conventional.

Brands available right now in at 18 Ah: Exide (7), Varta (6), Ritar (2), Fullriver (2), Mk Powered (1), Long (1). All with official warranty and live stock.

Cold cranking amps (CCA, EN standard) of the listed models range from 100 to 320 A. When replacing, pick a CCA equal or higher than your original: every amp counts in winter.

## Available models

| Modelo | V | Ah | CCA (EN) | L×An×Al mm | Tech | Polarity | € VAT incl. | Stock | URL |
|---|---|---|---|---|---|---|---|---|---|
| Motorcycle battery Varta YTX20L-BS (518901026) 12V 18Ah 250A AGM | 12 | 18 | 250 | 177×88×156 | AGM |  | 52,97 | ✓ | https://baterias.com/gb/battery-varta-moto-12v-18ah-ytx20l-4-ytx20l-bs-518901026 |
| Motorcycle battery Exide ETX20HL-BS 12V 18Ah 270A AGM | 12 | 18 | 270 | 175×90×155 | AGM |  | 48,61 | ✓ | https://baterias.com/gb/battery-exide-etx20hl-bs-12v-18ah-270a |
| Motorcycle battery Exide ETX20CH-BS 12V 18Ah 230A AGM | 12 | 18 | 230 | 150×90×160 | AGM |  | 57,26 | ✓ | https://baterias.com/gb/battery-exide-etx20ch-bs-12v-18ah-230a |
| Deep-cycle battery MK Powered ES17-12 12V 17Ah AGM | 12 | 18 | 0 | 181×76×167 | AGM |  | 80,74 | ✓ | https://baterias.com/gb/battery-mk-es17-12-agm-12v-18ah |
| Motorcycle battery Exide AGM12-18 12V 18Ah 250A AGM | 12 | 18 | 250 | 180×75×165 | AGM |  | 67,59 | ✓ | https://baterias.com/gb/battery-exide-agm12-18-12v-18ah-250a |
| Ritar RT12180 stationary UPS battery 12V 18Ah AGM | 12 | 18 | 0 | 181×77×167 | AGM |  | 63,36 | ✓ | https://baterias.com/gb/battery-ritar-rt12180-12v-18ah-rt-agm |
| Motorcycle battery Exide ETX20H-BS 12V 18Ah 270A AGM | 12 | 18 | 270 | 175×90×155 | AGM |  | 57,06 | ✓ | https://baterias.com/gb/battery-exide-etx20h-bs-12v-18ah-270a |
| Motorcycle battery Exide AGM12-19 12V 18Ah 270A AGM | 12 | 18 | 270 | 175×90×155 | AGM |  | 78,43 | ✓ | https://baterias.com/gb/battery-exide-agm12-19-12v-18ah-270a |
| Motorcycle battery Exide EB18L-A 12V 18Ah 190A | 12 | 18 | 190 | 180×90×160 | PLOMO/ACIDO |  | 53,06 | ✓ | https://baterias.com/gb/battery-exide-eb18l-a-12v-18ah-190a |
| Motorcycle battery Varta YB18L-A (518015018) 12V 18Ah 200A | 12 | 18 | 200 | 181×92×164 | PLOMO/ACIDO |  | 146,56 | ✓ | https://baterias.com/gb/battery-varta-moto-12v-18ah-yb18l-a-518015018 |
| Motorcycle battery Varta 51814 (518014015) 12V 0Ah 100A | 12 | 18 | 100 | 186×82×171 | PLOMO/ACIDO |  | 144,96 | ✓ | https://baterias.com/gb/battery-varta-motorcycle-12v-18ah-51814-518014015 |
| Motorcycle battery Varta YTX20HL-BS (518918032) 12V 18Ah 320A AGM | 12 | 18 | 320 | 175×87×154 | AGM |  | 80,89 | — | https://baterias.com/gb/battery-varta-motorcycle-12v-18ah-ytx20hl-bs-518918032 |
| Motorcycle battery Varta YTX20CH-BS (518908027) 12V 18Ah 270A AGM | 12 | 18 | 270 | 150×87×161 | AGM |  | 86,02 | — | https://baterias.com/gb/battery-varta-motorcycle-12v-18ah-ytx20ch-bs-518908027 |
| Deep-cycle battery Long WP18-12SHR 12V 18Ah AGM | 12 | 18 | 0 | 181×76×167 | AGM |  | 74,64 | — | https://baterias.com/gb/battery-long-wp18-12shr-12v-18ah |
| Motorcycle battery Varta YTX20-BS (518902026) 12V 18Ah 250A AGM | 12 | 18 | 250 | 177×88×156 | AGM |  | 111,93 | — | https://baterias.com/gb/battery-varta-moto-12v-18ah-ytx20-4-ytx20-bs-518902026 |
| Marine battery Fullriver FT265 12V 18Ah AGM | 12 | 18 | 265 | 170×99×175 | AGM |  | 118,34 | — | https://baterias.com/gb/battery-fullriver-ft265-12v-18ah-265a |
| Ritar HR12-70W stationary UPS battery 12V 18Ah AGM | 12 | 18 | 0 | 181×77×167 | AGM |  | 79,04 | — | https://baterias.com/gb/battery-ritar-hr12-70w-12v-18ah |
| Deep-cycle battery Fullriver HC18 12V 18Ah AGM | 12 | 18 | 265 | 170×99×175 | AGM |  | 172,09 | — | https://baterias.com/gb/battery-fullriver-hc18-12v-18ah-265-cca |
| Stationary battery Q-battery 12LS-18 12V 18Ah AGM | 12 | 18 | 0 | 181×77×167 | AGM |  | 72,19 | — | https://baterias.com/gb/battery-q-battery-12ls-18-12v-18ah |
| Motorcycle battery Exide AGM12-19.1 12V 18Ah 270A AGM | 12 | 18 | 270 | 175×90×155 | AGM |  | 78,43 | — | https://baterias.com/gb/battery-exide-agm12-19_1-12v-18ah-270a |
| Motorcycle battery Varta YTX20HL FA 12V 18Ah 310A | 12 | 18 | 310 | 176×89×154 | AGM |  | 80,89 | — | https://baterias.com/gb/battery-varta-motorcycle-12v-18ah-ytx20hl-fa-518919031 |

## Frequently asked questions

### How much does a 18Ah battery cost?
Between 48.61 € and 172.09 €, VAT included, depending on technology (AGM, lead-acid) and brand. Price grows with cold cranking amps (CCA) and Start-Stop technologies such as EFB or AGM.

### Can I fit a battery with more capacity than 18Ah?
Yes, as long as the dimensions and terminal layout match your tray and the CCA is equal or higher than the original. What you should never do is fit LESS capacity than the manufacturer specifies.

### What sizes do 18Ah batteries usually have?
The most common sizes for this rating are 175x90x155 · 181x77x167 · 177x88x156 (length × width × height, in mm). Always check your tray before buying: each product page lists exact dimensions.

### AGM, EFB or conventional for my car?
It depends on the equipment: with advanced Start-Stop (regenerative braking) fit AGM; with basic Start-Stop, EFB — or AGM, never less —; without Start-Stop a quality conventional battery is enough. On this page you can filter by technology to see only the ones that suit your case.

### How do I know which polarity I need?
Look at your current battery from the front with the terminals on the far side: if the positive (+) sits on the right it is right polarity; on the left, left polarity. Every card shows the polarity and you can filter by it above — with the wrong polarity the cables will not reach the terminal.

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Updated: 2026-08-03 · https://baterias.com/gb/batteries-18ah