# Car batteries equipped with start stop system > EFB and AGM batteries for Start-Stop cars with or without regen braking. Varta Blue/Silver Dynamic, Tudor EFB/AGM Microhybrid, Exide Premium **Category:** [Start](https://baterias.com/gb/beginning) → [Batteries](https://baterias.com/gb/batteries) → [Starter Batteries](https://baterias.com/gb/starter-batteries) - **Canonical URL**: https://baterias.com/gb/car-batteries-equipped-with-start-stop-system - **Language**: en-GB ## Description **Start-Stop batteries** — EFB and AGM — are built for cars with automatic stop/start. Start-Stop shuts the engine off at every stop (traffic lights, queues) and restarts it the instant you release the clutch or brake pedal, putting the battery through 10-30 cranking cycles a day, multiplied over the vehicle's whole life. A conventional SLI battery would fail in 6-12 months under that load; you need **EFB** (basic Start-Stop, no regenerative braking) or **AGM** (Start-Stop with regenerative braking, mild hybrids, or cars with heavy electrical loads). ## EFB vs AGM in Start-Stop **EFB** is the direct upgrade from SLI: thicker plates, reinforced separators, double the cycles. Good for basic Start-Stop on superminis and compacts without energy recovery. **AGM** wraps the electrolyte in a fibreglass mat, tolerates 90° tilt, is spill-proof and triples SLI cycle life. It's mandatory for Start-Stop with regenerative braking (BMW EfficientDynamics, Mercedes BlueEFFICIENCY, Audi e-tron quattro, Volvo Drive-E) and strongly recommended on cars with heavy electrical loads (premium audio, heated seats, dashcam). ### If your car came with AGM, never downgrade to EFB or SLI The vehicle's charging system is calibrated for the AGM profile. Dropping technology burns out the battery within months and can disable electronic features (comfort locking, parking sensors, dashcam). ### Compatibility and how to choose the right Start-Stop battery Enter your **make, model, engine and year** in our [plate-based battery finder](/gb/battery-finder-by-plate) or use the [comparison tool](/gb/comparator) to confirm whether your car needs EFB or AGM, and compare capacity (Ah), cranking current (A/EN) and dimensions before buying. ### Leading brands - [Varta Blue Dynamic EFB](/gb/batteries-varta-blue-dynamic-efb) - [Varta Silver Dynamic AGM](/gb/batteries-varta-silver-dynamic-agm) - [Tudor EFB / AGM Microhybrid](/gb/batteries-tudor) - [Exide Premium AGM](/gb/batteries-exide) ## Frequently asked questions about Start-Stop batteries ### **How long does a Start-Stop EFB or AGM battery last?** An EFB typically lasts 3-5 years and an AGM 4-6 years under normal use, depending on climate and driving habits. ### **What happens if I fit a conventional SLI battery in a Start-Stop car?** It degrades within 6-12 months because it isn't built for the frequent, deep stop/start cranking cycles. ### **How do I know if my car needs EFB or AGM?** It depends on whether Start-Stop includes regenerative braking (then AGM) or is basic (EFB); check the original battery's label or enter your plate in our finder. ### **Does a Start-Stop battery need coding or a reset after replacement?** Many German vehicles (BMW, Mercedes, Audi, VW) require registering the new battery in the energy-management system; check the manual or visit a garage. ### **Is any AGM Start-Stop battery compatible across brands?** It must match the original in capacity (Ah), cranking current (A/EN), dimensions and polarity; our plate-based finder shows the compatible references. Catalogue curated by our technical team. **10,960 Trustpilot reviews · 4.4/5**. 24h mainland delivery, free 14-day returns. ## Products in this category | Product | Brand | Price | |---|---|---| | [Start-Stop battery Varta A7 12V 70Ah 760A AGM](https://baterias.com/gb/battery-varta-a7-agm-12v-70ah-760a) | VARTA | 118,15 € | | [Start-Stop battery Varta E39 12V 70Ah 760A AGM](https://baterias.com/gb/battery-varta-e39-agm-12v-70ah-760a) | VARTA | 118,15 € | | [Start-Stop battery Varta A6 12V 80Ah 800A AGM](https://baterias.com/gb/battery-varta-a6-agm-12v-80ah-800a) | VARTA | 146,65 € | | [Start-Stop battery Varta N70 12V 70Ah 760A EFB](https://baterias.com/gb/battery-varta-n70-efb-12v-70ah-760a) | VARTA | 110,15 € | | [Start-Stop battery Varta F21 12V 80Ah 800A AGM](https://baterias.com/gb/battery-varta-f21-agm-12v-80ah-800a) | VARTA | 146,65 € | | [Start-Stop battery Varta A5 12V 95Ah 850A AGM](https://baterias.com/gb/battery-varta-a5-agm-12v-95ah-850a) | VARTA | 169,95 € | | [Start-Stop battery Varta N60 12V 60Ah 640A EFB](https://baterias.com/gb/battery-varta-n60-12v-60ah-640a) | VARTA | 90,70 € | | [Start-Stop battery Varta G14 12V 95Ah 850A AGM](https://baterias.com/gb/battery-varta-g14-agm-12v-95ah-850a) | VARTA | 171,05 € | | [Start-Stop battery Varta A8 12V 60Ah 680A AGM](https://baterias.com/gb/battery-varta-a8-agm-12v-60ah-680a) | VARTA | 106,70 € | | [Start-Stop battery Varta A4 12V 105Ah 950A AGM](https://baterias.com/gb/battery-varta-a4-agm-12v-105ah-950a) | VARTA | 172,14 € | | [Start-Stop battery Exide EL700 12V 70Ah 760A EFB](https://baterias.com/gb/battery-exide-el700-12v-70ah-720a) | EXIDE | 83,95 € | | [Start-Stop battery Varta D52 12V 60Ah 680A AGM](https://baterias.com/gb/battery-varta-d52-agm-12v-60ah-680a) | VARTA | 107,15 € | | [Start-Stop battery Exide EK800 12V 80Ah 800A AGM](https://baterias.com/gb/battery-exide-ek800-12v-80ah-800a) | EXIDE | 118,57 € | | [Start-Stop battery Exide EK700 12V 70Ah 760A AGM](https://baterias.com/gb/battery-exide-ek700-12v-70ah-760a) | EXIDE | 103,19 € | | [Start-Stop battery Varta H15 12V 105Ah 950A AGM](https://baterias.com/gb/battery-varta-h15-agm-12v-105ah-950a) | VARTA | 172,14 € | ## 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 · 2026-08-03*