# Auxiliary battery Tudor TK457 12V 45Ah 380A AGM ![Auxiliary battery Tudor TK457 12V 45Ah 380A AGM](https://baterias.com/4642-home_default/battery-tudor-tk457-12v-45ah.jpg) > Tudor TK457 auxiliary battery 12V 45Ah 380A AGM. Dimensions 237×127×227 mm, + terminal on the left. 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-tk457-12v-45ah - **Language**: en-GB - **Brand**: TUDOR - **Reference**: BCOM-TUDOR-TK457 - **EAN**: 3661024057745 - **MPN**: TK457 - **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 | 3661024057745 | | Terminal layout | Positive left | | Terminal type | JIS taper post | | Hold down | B00 | | Cold cranking amps (EN) | 380 A | | Capacity (C20) | 45 Ah (c20) | ## Quick description **Tudor TK457 45Ah 380A** is a starter battery with OEM-equivalent quality, designed for modern passenger cars. Delivers reliable cold-cranks even after weeks of inactivity and supports stable auxiliary loads (lights, 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 left ⚖️ Weight 13,5 kg ## Description ## Auxiliary battery Tudor TK457 45Ah 380A 12V 12*V* Voltage 45*Ah* Capacity 380*A* Cold cranking 13.50*kg* Weight The **12 V**, **45 Ah** **Tudor TK457** auxiliary battery with AGM technology powers the auxiliary network of cars with advanced Start-Stop and heavy electronics. Its 237 × 127 × 227 mm and the positive terminal on the left make it the exact replacement for the 45 Ah battery fitted as standard to many vehicles with an auxiliary battery. - Protects the main battery and the alternator. - AGM: faster recharging and better cycle resistance than a conventional battery. - Direct replacement for the original auxiliary battery. - Supports advanced Start-Stop systems. ### Size, terminals and hold-down of the Tudor TK457 In terms of format, the Tudor TK457 measures 237 × 127 × 227 mm (length × width × height) and weighs 13.50 kg. The positive terminal on the left 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 JIS taper post terminals, the system that anchors and connects it in the vehicle. 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. ### What the Tudor TK457 is for The Tudor TK457 is designed for the auxiliary network of cars with advanced Start-Stop and heavy electronics: it stabilises the voltage and protects the main battery in cars with heavy electronics. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 13.50 kg, JIS taper post terminals and B00 hold-down. ### Technology inside the Tudor TK457 Tudor builds the TK457 to the same standards as the rest of its catalogue; what changes between references is capacity, format and terminal position. AGM (Absorbent Glass Mat) technology seals the electrolyte in glass microfibre. The result is a maintenance-free battery that is highly vibration-resistant and able to withstand deep discharges that would ruin a classic lead-acid battery. ### Tudor: the maker behind the TK457 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. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### Official warranty The Tudor TK457 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. ### How to make it last longer Replace it with the same technology and capacity as the original. The auxiliary battery works alongside the main one: if a support-network fault warning appears, check both. ### When you get it and how to return it Same-day dispatch from our warehouse for in-stock orders placed **before [[ks:cutoff]]**: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for **[[ks:return_days]] days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email. ## Frequently asked questions ### Is this battery AGM? What is it for? Yes. The TK457 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 TK457 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 fit the TK457 model in my car? 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 TK457 battery last? Expected lifespan of the Tudor TK457 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 TK457 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. ### Does this 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 TK457 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Tudor TK457? 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. ### What advantages does the Tudor TK457 AGM battery offer over an EFB? 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 TK457 is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Do I need to register the Tudor TK457 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 TK457 ships factory-charged at 80-90% so you can use it straight after fitting. ## Equivalent batteries - [OPTIMA YTS-2.7J](https://baterias.com/gb/battery-optima-yellow-top-yts-27j-8070-176--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 · 2026-09-28*