# Deep-cycle battery Deka 8G40 12V 37Ah GEL ![Deep-cycle battery Deka 8G40 12V 37Ah GEL](https://baterias.com/1024-home_default/battery-deka-8g40-12v-40ah.jpg) > Deka 8G40 deep-cycle battery 12V 37Ah GEL. Designed for deep discharges (80% DOD); ideal for solar, marine, caravan. 24 h delivery. **Category:** [Power Wheelchair Batteries](https://baterias.com/gb/batteries-for-electric-wheelchairs) β†’ [DEKA](https://baterias.com/gb/deka) - **Canonical URL**: https://baterias.com/gb/battery-deka-8g40-12v-40ah - **Language**: en-GB - **Brand**: DEKA - **Reference**: BCOM-DEKA-8G40 - **MPN**: 8G40 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | DEKA | | Reference | 8G40 | | Model | DEKA GEL | | Voltaje | 12 V | | Largo | 197.1 mm | | Ancho | 168.1 mm | | Alto | 174.8 mm | | Peso | 14.29 kg | | TecnologΓ­a | GEL | | Capacidad C20 (Ah) | 40 Ah (c20) | | Capacidad C10 (Ah) | 37 Ah (c10) | | Capacidad C5 (Ah) | 34 Ah (c5) | ## Quick description **Deka 8G40 12V 37Ah** is a deep-cycle battery optimised for repeated discharges down to 80 % DOD and thousands of life cycles. Ideal when the battery discharges and recharges daily rather than just cranking the engine (mobility scooters, backup systems, golf, pallet trucks). ### Why this deep-cycle battery?? - **Daily cycling without wear** handles deep discharges without losing capacity - **Sealed AGM/GEL** no maintenance, no risk of spills - **Thousands of useful cycles** over its full lifetime πŸ”Œ Voltage i 12 V ⚑ Capacity i 37 Ah C20 πŸ“ Dimensions i 197Γ—168Γ—175 mm βš™οΈ Technology i GEL βš–οΈ Weight i 14 kg 🏷️ Model i Deka GEL ## Description [ ](https://www.eastpennmanufacturing.com) ## Battery Deka 8G40 40Ah 12V The Battery DEKA 8G40 40Ah 12V GEL belongs to the Deka Gel batteries range, are lead-acid batteries regulated by valve designed to offer reliable energy for solar applications of a frequent deep cycle where minimum maintenance is required.Both Gel Solar Batteries and AGM Deka are built according to the same rigorous standards. Deka Gel's sealed batteries are the best for Off-Grid solar applications in remote areas since they have been tested in the field with tens of thousands of solar facilities worldwide, testing over time they exceed others, both bothGel batteries like AGM work well in cold and warm climates. In warm climates, gel batteries tend to last more than the AGM due to the nature of the deka gel electrolyte formula. ### Ideal for: - Solar systems - UPS systems - Super deep download applications ### Battery advantages and characteristics DEKA 8G40 40Ah 12V - Minimum maintenance - Resistant, polypropylene boxes of thick walls and impact absorbing - Patented technology, lead-calcio-high purity alloy grilles - Classified as non -dangerous, without restrictions for land transport and safe for air transport - It does not spill - Inclination, they can operate in virtually any position (not recommended face down) ### How to find the right battery for your vehicle or device? Take into account that GEL and AGM batteries are ideal for deep cycle applications, such as solar systems and electric vehicles, due to their ability to withstand deep discharges.Consider the type of climate in which you will use the battery and the maintenance you will need.Finally evaluate the space available for the installation of its battery, measures and of course, the technical specifications. If you do not find on our website the battery that needs or have doubts about which to acquire, contact us and we will advise you for free. ### Why choose a Battery Deka? Deka Batteries is the largest and most modern independent battery manufacturer.They manufacture millions of lead-acid batteries of different sizes and types for a very wide range of applications. ### Know more about the brand Deka Since 1946, Deka Batteries has an unparalleled reputation in the sector for the manufacture of quality products produced in avant -garde facilities, their batteries have earned a well -deserved reputation for their performance and robustness. The company produces more than 515 types of AKA brand batteries, as well as other brands known for cars, ships, motorcycles, forklifts, stationary support systems and many other applications. With more than 250 instead controls and an avant -garde manufacturing process as well as the use of first materials, batteries resulting in greater ilaity, useful life and excellent benefits. ## Frequently asked questions ### Is this battery GEL? What is the typical use? Yes, this model is a GEL battery: sealed lead-acid where the electrolyte is in gel form. It tolerates deep discharges very well and is ideal for cyclic use (solar, motorhomes, electric wheelchairs, motorcycles). Requires a GEL-specific smart charger β€” max charge voltage ~14.1 V (vs 14.4-14.7 V for AGM). Lifespan 6-10 years. ### How do I know if the 8G40 model fits my device? Three ways: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team for the 8G40; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year β€” we reply during business hours (Mon–Fri 9:00–18:00 CET). ### How do I fit the 8G40 model in my device? In most devices it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (βˆ’) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation β€” match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (βˆ’). On devices with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### What is the warranty period of this battery? The official manufacturer warranty is 2 years and covers manufacturing defects. It applies to defects such as damaged cells, internal short-circuits or abnormal capacity loss. Damage from misuse is excluded: prolonged overcharging, unsuitable chargers or a faulty alternator. Once the defect is verified by technical inspection, we replace the 8G40 at no cost. ### When will I receive the 8G40 model? In mainland Spain and Portugal it arrives in 24 h if you order before 17:00 and the battery is in stock β€” it leaves the same day and arrives the next business day. Afternoon or weekend orders ship the next business day. For Balearics, Canaries and other EU destinations, allow 2-5 days. Shipping cost is calculated in the cart based on destination and service (standard, express, cash on delivery). Tracking number is sent by email + SMS as soon as the parcel ships. ### Can I return the Deka 8G40 battery if it doesn't fit or doesn't work? Yes. You have 14 days from delivery to return it. In mainland Spain and Portugal returns are FREE β€” we cover the return shipping cost via prepaid label. In other EU countries the return shipping cost is the customer's. It must arrive in its original packaging with no signs of installation. If it was defective, the warranty covers replacement even after the 14-day period. ### Where can I buy the Deka 8G40 battery? At baterias.com β€” authorised distributor with real stock, 24h delivery in mainland Spain and Portugal if you order before 17:00, and full manufacturer warranty. Shipping cost is calculated in the cart based on destination and chosen service (standard, express, cash on delivery). Secure payment by card, Bizum, PayPal or bank transfer. If you choose at-home installation, our technician will take the used battery and dispose of it through an authorised collection point. ### How many years does this battery last? Expected lifespan of the Deka 8G40 is 6 to 10 years in cyclic use (marine, caravan, solar) with controlled discharges. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured. ### What are the dimensions of the Deka 8G40 battery? Dimensions (length Γ— width Γ— height) are 197Γ—168Γ—175 mm β€” also written as 197x168x175 mm β€” following the European DIN standard. Always measure the space in your device before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### How much does the Deka 8G40 battery weigh? It weighs 14,3 kg. Most of the weight is lead. If you plan to fit it yourself, use gloves and a carrying strap (AGM batteries are slightly heavier than conventional due to the absorbent glass-mat fibre). ### How many amps does the Deka 8G40 battery have? Nominal capacity 40 Ah[?cca: and [cold-cranking amps A]] at 12 V. Ah measure the total energy available (autonomy); CCA (also written A in cold or EN under the European standard) measure the instantaneous power to crank the starter motor. A battery with more CCA starts better in winter; one with more Ah keeps accessories on for longer. ### What are the equivalents of the 8G40 model? Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology β€” an EFB cannot be replaced with a conventional battery in Start-Stop devices. See the "Equivalents" section to view recommended options at the same performance level. ### Is the 8G40 model better than its equivalents from other brands? This battery and its equivalents from Bosch, Tudor or Exide are technically comparable: same dimensions, same voltage and same capacity. The differences are warranty (Varta and Bosch: 2 years; Tudor and Exide: 2 years on the equivalent line), manufacturing plant (Varta and Bosch share origin in the Clarios Group; Tudor and Exide belong to Stryten Energy) and price. For private use any of these brands will give 4-6 years of life. Compare them in the "Equivalents" section. ### What reviews does the 8G40 model have? The average rating of the Deka 8G40 on baterias.com is 4.8/5 from 17 verified customer reviews. The product rating, when available, is shown above and in the "Reviews" section. You can also check our public Trustpilot profile at shop level (4.4/5 from 10,540+ verified reviews). Most-praised points: reliable cold start, lifespan above 5 years and fast delivery; most common complaints mention BMS-equipped devices that need OBD registration after fitting. ## Reviews - **Average rating**: 4.6 / 5 (5 reviews) ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team β€” over 25 years of experience validating automotive batteries. β†’ https://baterias.com/gb/technical-team --- *baterias.com β€” Automotive batteries Β· 2026-07-06*