# 40Ah batteries We stock 21 batteries of 40 Ah (AGM, lead-acid, GEL) priced between 42.10 € and 296.53 €, 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. 40Ah is the typical capacity for petrol superminis and small hatchbacks (Citroën C3, Fiat Panda, Renault Clio and similar). A quality conventional battery is plenty for this segment if the car has no Start-Stop. At this rating we stock AGM, lead-acid, GEL. 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 40 Ah: Long (6), Varta (4), Fullriver (4), Exide (2), Tudor (2), Ritar (1). All with official warranty and live stock. Cold cranking amps (CCA, EN standard) of the listed models range from 225 to 500 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 | |---|---|---|---|---|---|---|---|---|---| | Car battery Varta A14 12V 40Ah 330A | 12 | 40 | 330 | 187×127×227 | PLOMO/ACIDO | | 42,10 | ✓ | https://baterias.com/gb/battery-varta-a14-12v-40ah-330a | | Car battery Varta A13 12V 40Ah 330A | 12 | 40 | 330 | 187×140×227 | PLOMO/ACIDO | | 47,70 | ✓ | https://baterias.com/gb/battery-varta-a13-12v-40ah-330a | | Car battery Varta A15 12V 40Ah 330A | 12 | 40 | 330 | 187×127×227 | PLOMO/ACIDO | | 43,10 | ✓ | https://baterias.com/gb/battery-varta-a15-12v-40ah-330a | | Deep-cycle battery MK Powered M40-12 SLD G 12V 40Ah GEL | 12 | 40 | 225 | 197×168×175 | GEL | | 180,10 | ✓ | https://baterias.com/gb/battery-mk-m40-12-sld-g-gel-12v-40ah | | Car battery Varta A16 12V 40Ah 340A | 12 | 40 | 340 | 175×175×190 | PLOMO/ACIDO | | 64,69 | ✓ | https://baterias.com/gb/battery-varta-a16-12v-40ah-340a | | Car battery Tudor TA406 12V 40Ah 350A | 12 | 40 | 350 | 187×127×220 | Flooded | | 72,89 | ✓ | https://baterias.com/gb/battery-tudor-ta406-12v-40ah-350a | | Marine battery Fullriver DC40-12 12V 40Ah AGM | 12 | 40 | 275 | 198×166×174 | AGM | | 162,33 | ✓ | https://baterias.com/gb/battery-agm-fullriver-dc40-12-12v-40ah | | Deep-cycle battery Long LG40-12N 12V 40Ah GEL | 12 | 40 | 0 | 199×166×171 | GEL | | 188,97 | — | https://baterias.com/gb/battery-long-lg40-12n-12v-40ah | | Deep-cycle battery Long WP40-12NE 12V 40Ah AGM | 12 | 40 | 0 | 198×166×171 | AGM | | 153,77 | — | https://baterias.com/gb/battery-long-wp40-12ne-12v-40ah | | Car battery Exide EC400 12V 40Ah 320A | 12 | 40 | 320 | 190×175×175 | PLOMO/ACIDO | | 72,32 | — | https://baterias.com/gb/battery-exide-ec400-12v | | Car battery Tudor TC400 12V 40Ah 320A | 12 | 40 | 320 | 175×175×190 | Flooded | | 63,04 | — | https://baterias.com/gb/battery-tudor-tc400-12v-40ah-320a | | Marine battery Fullriver FT500 12V 40Ah AGM | 12 | 40 | 500 | 250×97×206 | AGM | | 211,57 | — | https://baterias.com/gb/battery-fullriver-ft500-12v-40ah-500a | | Marine battery Fullriver DCG40-12 12V 40Ah AGM | 12 | 40 | 0 | 198×166×171 | AGM | | 175,29 | — | https://baterias.com/gb/battery-fullriver-dcg40-12-12v-40ah | | Deep-cycle battery Fullriver HC40 12V 40Ah AGM | 12 | 40 | 500 | 250×97×206 | AGM | | 296,53 | — | https://baterias.com/gb/battery-fullriver-hc40-12v-40ah-500-cca | | Ritar HR12-150W stationary UPS battery 12V 40Ah AGM | 12 | 40 | 0 | 198×166×169 | AGM | | 169,81 | — | https://baterias.com/gb/battery-ritar-hr12-150w-12v-hr-agm | | Deep-cycle battery Long LG40-12 12V 40Ah GEL | 12 | 40 | 0 | 199×166×171 | GEL | | 188,97 | — | https://baterias.com/gb/battery-long-lg40-12-12v-40ah | | Deep-cycle battery Long WP40-12 12V 40Ah AGM | 12 | 40 | 0 | 198×166×171 | AGM | | 153,77 | — | https://baterias.com/gb/battery-long-wp40-12-12v-40ah | | Deep-cycle battery Long WP40-12N 12V 40Ah AGM | 12 | 40 | 0 | 198×166×171 | AGM | | 153,77 | — | https://baterias.com/gb/battery-long-wp40-12n-12v-40ah | | Deep-cycle battery Long WP40-12E 12V 40Ah AGM | 12 | 40 | 0 | 198×166×171 | AGM | | 153,77 | — | https://baterias.com/gb/battery-long-wp40-12e-12v-40ah | | Marine battery Exide ES450 12V 40Ah GEL | 12 | 40 | 280 | 207×175×175 | GEL | | 117,10 | — | https://baterias.com/gb/battery-exide-es450-12v-40ah-280a | | Car battery Kronobat SD-40.0B 12V 40Ah 340A | 12 | 40 | 340 | 175×175×190 | PLOMO/ACIDO | | 74,40 | — | https://baterias.com/gb/best-price-battery-12v-40ah-sd-40_0b | | Car battery Varta A10 12V 40Ah 420A | 12 | 40 | 420 | 175×175×190 | AGM | | 104,99 | — | https://baterias.com/gb/battery-varta-a10-12v-40ah-420a | ## Frequently asked questions ### How much does a 40Ah battery cost? Between 42.10 € and 296.53 €, VAT included, depending on technology (AGM, lead-acid, GEL) 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 40Ah? 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 40Ah batteries usually have? The most common sizes for this rating are 198x166x171 · 175x175x190 · 250x97x206 (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. --- Updated: 2026-07-20 · https://baterias.com/gb/batteries-40ah