# Auxiliary battery Tudor TK111 12V 11Ah 150A AGM ![Auxiliary battery Tudor TK111 12V 11Ah 150A AGM](https://baterias.com/960-home_default/battery-tudor-tk111-11ah-150a.jpg) > Tudor TK111 auxiliary battery 12V 11Ah 150A AGM. Start-Stop Auxiliary range. Dimensions 150×90×130 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-tk111-11ah-150a - **Language**: en-GB - **Brand**: TUDOR - **Reference**: BCOM-TUDOR-TK111 - **EAN**: 3661024056564 - **MPN**: TK111 - **Price**: 169,70 € (VAT incl., Spain) - **Last updated**: 2026-10-28 - **Stock**: In stock ## Technical specifications | Feature | Value | |---|---| | Brand | TUDOR | | Reference | TK111 | | Model | TUDOR AUXILIAR | | Voltage (V) | 12 V | | Largo | 150 mm | | Ancho | 90 mm | | Alto | 130 mm | | Tecnología | AGM | | EAN | 3661024056564 | | Terminal layout | Positive terminal on the left | | Cold cranking amps (EN) | 150 A | | Capacity (C20) | 11 Ah (c20) | ## Quick description **Tudor TK111 12V 11Ah 150A** is an auxiliary battery: it supports the Start-Stop system and on-board electronics during stops, without draining the main battery. ## Why this auxiliary 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 11 Ah C20 🔋 Cold cranking 150 A EN-1 📏 Dimensions 150×90×130 mm ⚙️ Technology AGM 🧭 Polarity Positive on the left ⚖️ Weight 3,9 kg 🏷️ Model TUDOR Start-Stop Auxiliary ## Description ## Auxiliary battery Tudor TK111 Auxiliar 11Ah 150A 12V 12*V* Voltage 11*Ah* Capacity 150*A* Cold cranking 3.90*kg* Weight The **12 V**, **11 Ah** **Tudor TK111** auxiliary battery from the **Auxiliar** range with AGM technology powers the auxiliary network of cars with advanced Start-Stop and heavy electronics. It measures 150 × 90 × 130 mm and the positive terminal on the left, the format sought by anyone replacing a 11 Ah battery in vehicles with an auxiliary battery. - Stabilises the onboard network voltage. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Maintenance-free. - Sealed AGM: safe when installed in the cabin. ### Vehicles compatible with the Tudor TK111 This battery appears as compatible in more than 88 vehicles from manufacturers such as Mercedes-Benz, BMW, Audi, Volvo, Citroën and Alpina. If you are looking for a **battery for a Mercedes-Benz** or BMW with these dimensions, the TK111 is one of the usual replacement references. In our database it is cross-referenced against 8 original-equipment part numbers, which gives an idea of its real coverage. ### Will it fit your current battery tray? In terms of format, the Tudor TK111 measures 150 × 90 × 130 mm (length × width × height) and weighs 3.90 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. 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. ### Tudor: the maker behind the TK111 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. ### The Tudor TK111: Auxiliar range and AGM technology The TK111 is part of the Tudor **Auxiliar** range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family. 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. ### Care and maintenance 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. ### Warranty and coverage The Tudor TK111 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. ### Shipping, delivery 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 TK111 an AGM battery and what are the benefits of AGM? Yes. The TK111 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 TK111 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 long does the Tudor TK111 battery last? Expected lifespan of the Tudor TK111 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 TK111 battery? Dimensions (length × width × height) are 150×90×130 mm — also written as 150x90x130 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. ### What polarity does the Tudor TK111 battery have? Polarity: positive on the left. To identify it, place the battery in front of you with the terminals facing you and check which side the positive (+, marked with a red ring) is on. Before buying, verify the polarity matches your current battery: switching polarity forces longer cables or system reconfiguration, with short-circuit risk. ### 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 TK111 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Tudor TK111? 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. ### Why choose AGM instead of EFB for my Start-Stop car? 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 TK111 is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Will my car recognise the new battery automatically? 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 TK111 ships factory-charged at 80-90% so you can use it straight after fitting. ## Equivalent batteries - [EXIDE EK111](https://baterias.com/gb/battery-exide-ek111-12v-11ah-150a) - [VARTA 510909017](https://baterias.com/gb/battery-varta-motorcycle-12v-10ah-ytx12-4-fa-510909017) ## 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 · 2026-10-28*