The 2019 Volkswagen Golf R (L420L) requires a 12V AGM or EFB battery optimized for start-stop systems, typically in H6 (Group 48) size with 60–70Ah capacity and 680–760 CCA. Varta AGM H6 (70Ah/760CCA) and EFB H6 (70Ah/720CCA) batteries are direct-fit solutions, supporting regenerative braking systems while maintaining optimal cranking performance in extreme temperatures (-30°C to +60°C). Installation requires precise terminal orientation (right-side positive) and ECU registration for capacity synchronization.
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What specifications define compatibility?
A compatible battery must match Group 48 (H6) dimensions (278×175×190mm) with 12V output and 70Ah nominal capacity. Pro Tip: Mismatched Ah ratings trigger dashboard warnings—always replace with OEM-spec capacity (±5%).
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The Golf R's start-stop system demands low internal resistance (<3mΩ) and high cycle life (≥30,000 charge cycles at 15% DOD). AGM batteries like Varta F21 (H6/70Ah) handle 180A regenerative charging currents, critical for energy recovery during braking. For colder climates, prioritize CCA values ≥700A (e.g., Varta AGM E39: 760CCA at -18°C). Real-world example: A 70Ah EFB battery lasts 5–7 years in moderate climates, while AGM extends to 8–10 years with proper voltage regulation.
AGM vs. EFB: Which suits the Golf R better?
AGM batteries excel in charge acceptance (92% vs. EFB's 85%) but cost 30–40% more. EFB balances performance and affordability for urban driving cycles.
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AGM technology uses glass mat separators to achieve 1.5× deeper discharge cycles than EFB, making it ideal for vehicles with frequent engine restarts. However, EFB batteries like Varta Silver Dynamic (70Ah/720CCA) still meet VW's TL 825 06 standards for start-stop systems at lower cost. The table below compares key parameters:
| Parameter | AGM | EFB |
|---|---|---|
| Cycle Life @ 50% DOD | 500 | 300 |
| Charge Rate | Up to 16V | Up to 15V |
| Cost (USD) | $320–$400 | $220–$300 |
For example, owners averaging 20 daily start cycles save $150+ over 5 years with AGM due to extended lifespan. Conversely, EFB suffices if you disable start-stop features regularly.
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FAQs
No—VW's battery management system (BMS) requires exact Ah matching. A 75Ah battery causes charging errors even if physically fits.
How often should the battery be replaced?
AGM: 8–10 years; EFB: 5–7 years. Symptoms like >4-second cranking or frequent start-stop deactivation indicate replacement needs.
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