# Start-Stop battery Tudor TK508 AGM Microhybrid 12V 50Ah 800A AGM ![Start-Stop battery Tudor TK508 AGM Microhybrid 12V 50Ah 800A AGM](https://baterias.com/958-home_default/battery-tudor-tk508-50ah-800a.jpg) > Tudor TK508 Start-Stop battery 12V 50Ah 800A AGM. Dimensions 260×173×206 mm. Built for Start-Stop and regenerative braking: more cycles and fast recharge. **Category:** [Car batteries equipped with start stop system](https://baterias.com/gb/car-batteries-equipped-with-start-stop-system) → [TUDOR](https://baterias.com/gb/tudor) - **Canonical URL**: https://baterias.com/gb/battery-tudor-tk508-50ah-800a - **Language**: en-GB - **Brand**: TUDOR - **Reference**: BCOM-TUDOR-TK508 - **EAN**: 3661024056595 - **MPN**: TK508 - **Price**: 142,60 € (VAT incl., Spain) - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | TUDOR | | Reference | TK508 | | Model | TUDOR AGM MICROHYBRID | | Voltage (V) | 12 V | | Largo | 260 mm | | Ancho | 173 mm | | Alto | 206 mm | | Tecnología | AGM | | EAN | 3661024056595 | | Terminal layout | 9 | | Cold cranking amps (EN) | 800 A | | Capacity (C20) | 50 Ah (c20) | ## Quick description **Tudor TK508 12V 50Ah 800A** is a dedicated Start-Stop battery with AGM/EFB technology. Withstands intensive cycling at traffic-light stops (hundreds of cranks per day), recharges quickly while driving and keeps comfort loads alive during long idle periods. ## Why this Start-Stop battery? - **Designed for Start-Stop** built for the intensive cycling of modern cars - **2 to 3 times longer life** vs fitting a cheap conventional battery - **Fast recovery** recharges in minutes once the engine is running 🔌 Voltage 12 V ⚡ Capacity 50 Ah C20 🔋 Cold cranking 800 A EN-1 📏 Dimensions 260×173×206 mm ⚙️ Technology AGM ⚖️ Weight 17,5 kg 🏷️ Model TUDOR AGM ## Description ## Start-Stop battery Tudor TK508 AGM Microhybrid 50Ah 800A 12V 12*V* Voltage 50*Ah* Capacity 800*A* Cold cranking 17.50*kg* Weight The **Tudor TK508** with AGM technology delivers the **50 Ah** at **12 V** and **800 A** of cold cranking current (EN) that cars with Start-Stop, regenerative braking and heavy electrical loads need. It measures 260 × 173 × 206 mm, the format sought by anyone replacing a 50 Ah battery in Start-Stop cars. - Withstands hundreds of starts a day without degrading. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Up to three times the cycles of a conventional battery. - Compatible with regenerative braking and energy management (BMS). ### What the Tudor TK508 is for The Tudor TK508 is designed for cars with Start-Stop, regenerative braking and heavy electrical loads. If your car was fitted with an AGM or EFB battery, always replace it with the same technology: a conventional model would degrade within months. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 17.50 kg. ### Size, terminals and hold-down of the Tudor TK508 In terms of format, the Tudor TK508 measures 260 × 173 × 206 mm (length × width × height) and weighs 17.50 kg. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change. ### The Tudor TK508: AGM Microhybrid range and AGM technology Within the Tudor catalogue, the **AGM Microhybrid** series groups the references designed for this use. The TK508 is the 50 Ah model of that family, with the same performance as its siblings in other sizes. In an AGM battery the electrolyte is absorbed in glass-fibre separators: there is no free liquid, it cannot spill and it can be mounted at an angle. That construction lowers internal resistance, speeds up recharging and multiplies cycle life compared with a conventional battery. ### Why choose Tudor batteries Tudor is Spain's historic battery brand, today part of the Exide group. Its car, truck, motorcycle and leisure ranges are built with the same technology and controls as the group's original-equipment references. All the Tudor batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Warranty and coverage The Tudor TK508 comes with the **manufacturer's official warranty**. To keep it valid, always fit the same technology as the original battery (AGM or EFB) and register the replacement if your vehicle requires it. ### Usage and maintenance tips If the vehicle only does very short trips, a periodic maintenance charge with an AGM/EFB-compatible charger greatly extends its life. In a Start-Stop car the battery is controlled by the ECU; after replacing it, the new battery may need to be registered so the system adjusts charging. ### Delivery times and returns Orders placed **before 6:00 pm** with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic Islands and the rest of the European Union allow 3 to 5 working days. You have **14 days** to return an unused battery; in mainland Spain and Portugal collection is free. We email you the tracking number as soon as the parcel ships. ## Frequently asked questions ### Is the Tudor TK508 an AGM battery and what are the benefits of AGM? Yes, it is AGM. In an AGM battery such as the TK508, the electrolyte is not free but absorbed in a glass-fibre mat inside a sealed lead-acid battery. Compared with a conventional battery it withstands more charge/discharge cycles and handles heat better; it is the required technology for cars with advanced Start-Stop and regenerative braking. ### Is the TK508 model suitable for Start-Stop cars? Yes: being AGM, the Tudor TK508 is designed for Start-Stop cars. AGM batteries support advanced Start-Stop and regenerative braking thanks to their higher cycle count. If the car recovers energy when braking, AGM is recommended for its higher cycle count; for basic Start-Stop, EFB. The manufacturer's specification comes first. Registering it via OBD is advisable on most modern cars (the alternator then applies the optimum profile), but it works from the start. ### How is the Tudor TK508 battery fitted in a Start-Stop car? With a 10 mm spanner, swapping in the Tudor TK508 takes 15 to 30 minutes on most cars; if the battery sits in the boot or under a seat, allow up to twice as long. If the car has Start-Stop or BMS: a) the technology must match the original (AGM or EFB) or be higher, because a conventional battery would fail within months; b) undo the negative cable at its nut, leaving the IBS sensor in place; c) it is advisable to register the battery via OBD so the alternator applies the proper charging profile. What matters most is the terminal order: removing, negative (−) before positive (+); refitting, positive (+) before negative (−). In between, with the engine off and the key out, release the clamp and fit the new battery the same way round as the original (polarity). Before you start, check the car handbook: the manufacturer's procedure always comes first. Our full step-by-step guide is on the blog. ### What is the service life of the TK508 model? As a guide, you can expect the Tudor TK508 to last 5 to 8 years in mild-climate car use with Start-Stop, although the real figure may be higher or lower. What weighs most: temperature (cold makes starts harder and intense heat evaporates the electrolyte), frequent short trips, the condition of the alternator and charging system, power draw while parked and maintenance, not forgetting the type of car and Start-Stop. ### What are the dimensions of the Tudor TK508 battery? Length × width × height: 260x173x206 mm. Height is measured to the top of the terminals. Measure your car's battery tray first; if the battery exceeds it by even a millimetre, the hold-down clamp may not close. ### Will the Tudor TK508 battery fit my car? Three routes: the "Compatible vehicles" tab on this page, with the vehicles verified by our technical team; your number plate in the finder, from which DGT/DVLA/KBA detect model and engine; and WhatsApp, with make, model, engine and year, during business hours (Mon–Fri 10:00–13:30 and 16:30–18:00 (Spanish time, CET)). If our table and the car handbook disagree, go with what the manufacturer says. ### Which batteries are equivalent to the Tudor TK508? The "Equivalents" section of this page gathers the recommended options with equivalent performance; remember that in Start-Stop cars an EFB should not be replaced with a conventional battery. To replace the Tudor TK508 without modifications, the other battery must be identical in size, polarity, Ah and CCA. ### Tudor TK508 or Exide EK508: which one to choose? It is the verified Exide equivalent for the TK508 tray. Compared with the TK508 it has the same Ah and cranking power. It costs 2,10 € less. Decide by price, brand preference and availability: both fit and crank the same. ### What advantages does the Tudor TK508 AGM battery offer over an EFB? Compared with an EFB it resists tilted positions, heavy vibration and extreme temperatures better, and it is the recommended option where there is regenerative braking (BMW EfficientDynamics, Mercedes Eco, Audi MHEV, Land Rover ECO, Volvo i-Stop). Many more charge/discharge cycles than a conventional battery and no leaks: that is what AGM technology brings, with the electrolyte absorbed in glass fibre. This TK508 delivers 800 A cold cranking (EN). ### Do I need to register the Tudor TK508 on the car after installation? It is not strictly necessary on most cars, because the alternator detects the change and adapts the charge. The advisable step is to register it via OBD: the charging profile is optimum from the first minute and the battery lasts longer, especially on brands with sophisticated BMS (BMW, Mercedes, Audi, Volvo, Land Rover). Any garage with an OBD scanner can do it in a few minutes. If you prefer to do it yourself: VCDS / Carista (VAG), Bimmercode (BMW) or iCarsoft. If you do not register the TK508, it will keep starting fine while the alternator adjusts the profile over a few days. ## Equivalent batteries - [EXIDE EK508](https://baterias.com/gb/battery-exide-ek508-12v-50ah-800a) ## Reviews - **Average rating**: 5 / 5 (1 reviews) Average rating 5/5 from 1 verified-purchase reviews (ks_recovery, unfiltered). The 3 most recent: - ★★★★★ **Juan Carlos G.** (2026-09-18): *Batería* — Buen arranque en un Jeep todo terreno encaja bien el arranque fenomenal la anterior era una exide de las mismas características y duro ocho años espero que está también ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2012. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-11-10*