# Auxiliary battery Tudor TK454 12V 45Ah 380A AGM ![Auxiliary battery Tudor TK454 12V 45Ah 380A AGM](https://baterias.com/4640-home_default/battery-tudor-tk454-12v-45ah.jpg) > Tudor TK454 auxiliary battery 12V 45Ah 380A AGM. Dimensions 237×127×227 mm, + terminal on the right. Check fitment by plate. **Category:** [Auxiliary Batteries](https://baterias.com/gb/auxiliary-batteries) → [TUDOR](https://baterias.com/gb/tudor) - **Canonical URL**: https://baterias.com/gb/battery-tudor-tk454-12v-45ah - **Language**: en-GB - **Brand**: TUDOR - **Reference**: BCOM-TUDOR-TK454 - **EAN**: 3661024057738 - **MPN**: TK454 - **Price**: 212,40 € - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Largo | 237 mm | | Ancho | 127 mm | | Alto | 227 mm | | Peso | 13.5 kg | | Tecnología | AGM | | EAN | 3661024057738 | | Terminal layout | Positive right | | Terminal type | EN taper post | | Hold down | B00 | | Cold cranking amps (EN) | 380 A | | Capacity (C20) | 45 Ah (c20) | ## Quick description **Tudor TK454 45Ah 380A** is a ready-to-use passenger car battery, sealed and maintenance-free. Delivers the cranking amps the engine needs in cold weather and keeps stable voltage for modern car loads (ECU, sensors, climate control, infotainment). ### Why this car battery? - **Original-equipment quality** without dealership prices - **Lasts 4 to 6 years** buy once instead of twice - **Real human tech support** if you have any doubts before buying ⚡ Capacity 45 Ah C20 🔋 Cold cranking 380 A EN-1 📏 Dimensions 237×127×227 mm ⚙️ Technology AGM 🧭 Polarity Positive on the right ⚖️ Weight 13,5 kg ## Description ## Auxiliary battery Tudor TK454 45Ah 380A 12V 12*V* Voltage 45*Ah* Capacity 380*A* Cold cranking 13.50*kg* Weight Designed for the auxiliary network of cars with advanced Start-Stop and heavy electronics, the **Tudor TK454** stabilises the voltage with **45 Ah** with AGM technology. Its 237 × 127 × 227 mm and the positive terminal on the right make it the exact replacement for the 45 Ah battery fitted as standard to many vehicles with an auxiliary battery. - Direct replacement for the original auxiliary battery. - Supports advanced Start-Stop systems. - Protects the main battery and the alternator. - AGM: faster recharging and better cycle resistance than a conventional battery. ### Dimensions, polarity and mounting The Tudor TK454 is made in the 237 × 127 × 227 mm format and weighs 13.50 kg. The positive terminal on the right decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses a B00 hold-down and EN taper post terminals, the system that anchors and connects it in the vehicle. Before replacing it, measure your current battery tray: if all three dimensions and the terminal positions match, the swap is direct and needs no adapters. ### What the Tudor TK454 is for With 45 Ah, the Tudor TK454 is the direct replacement for the original auxiliary battery in the auxiliary network of cars with advanced Start-Stop and heavy electronics. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 13.50 kg, EN taper post terminals and B00 hold-down. ### Technology inside the Tudor TK454 Within the Tudor catalogue, the TK454 is the 45 Ah model designed for this application. 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. ### Tudor: the maker behind the TK454 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. We guarantee that every Tudor arrives new, charged and with the manufacturer's full warranty. ### Official warranty The Tudor TK454 comes with the **manufacturer's official warranty** against manufacturing defects. If it fails through a defect within the warranty period, we replace it at no cost to you. ### Usage and maintenance tips The auxiliary battery works alongside the main one: if a support-network fault warning appears, check both. Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. ### When you get it and how to return it Order **before [[ks:cutoff]]** with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have **[[ks:return_days]] days** to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email. ## Frequently asked questions ### Is the Tudor TK454 an AGM battery and what are the benefits of AGM? Yes. The TK454 from Tudor uses AGM (Absorbent Glass Mat) technology: a sealed lead-acid battery where the electrolyte is absorbed in a glass-fibre mat. It withstands more charge/discharge cycles than a conventional one, handles heat better and is the required technology for cars with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions. ### Is the Tudor TK454 battery suitable for Start-Stop? Yes. As AGM technology it is designed for Start-Stop vehicles. AGM batteries support advanced Start-Stop and regenerative braking thanks to their higher cycle count. EFB is recommended for basic Start-Stop; AGM is recommended when regenerative braking is also present, thanks to its higher cycle capability. It works straight out of the box — on most modern vehicles registering the battery via OBD is recommended so the alternator automatically applies the optimal charging profile. ### How do I change this battery step by step? In most cars 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 (−) 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 — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### How long does the Tudor TK454 battery last? Expected lifespan of the Tudor TK454 is 5 to 8 years in mild-climate car use with Start-Stop. 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 Tudor TK454 battery? Dimensions (length × width × height) are 237×127×227 mm — also written as 237x127x227 mm — following the European DIN standard. Always measure the space in your car before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### Will the Tudor TK454 battery fit my car? Three options to confirm: 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; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The TK454 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the TK454 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 — an EFB cannot be replaced with a conventional battery in Start-Stop cars. See the "Equivalents" section to view recommended options at the same performance level. ### When do I need an AGM battery like this one? AGM (Absorbent Glass Mat) technology uses absorbent fibreglass that retains the electrolyte, eliminating leaks and allowing up to 3× more charge/discharge cycles than a conventional battery. It is the recommended option when the car has advanced Start-Stop with regenerative braking (BMW EfficientDynamics, Mercedes Eco, Audi MHEV, Land Rover ECO, Volvo i-Stop). Withstands tilted positions, high vibration and extreme temperatures better than EFB. The Tudor TK454 is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Do I need to register the Tudor TK454 on the car after installation? On most cars it is not strictly necessary — the alternator detects the new battery and adapts the charge automatically. It is recommended to register the battery via OBD so that the alternator applies the optimal charging profile from the first minute and extends the battery life as much as possible (especially on brands with sophisticated BMS: BMW, Mercedes, Audi, Volvo, Land Rover). Any workshop with an OBD scanner (~10-15 € labour) does it in 5 minutes. DIY apps: VCDS / Carista (VAG), Bimmercode (BMW), iCarsoft. If you do not register, the car will still start correctly — the alternator just takes a few days to adjust the profile. The Tudor TK454 ships factory-charged at 80-90% so you can use it straight after fitting. ## Equivalent batteries - [OPTIMA YTR-2.7](https://baterias.com/gb/battery-optima-yellow-top-ytr-27-8073-176-12v-38ah) ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-09-30*