BMW 12V Lithium Dual-Storage Battery Repair Service G20 G30 G05 G11 G12

### Is your BMW showing a "Battery Management" error or has your Start/Stop system stopped working? Don’t spend thousands of dollars at the dealership for a new unit. Most 12V Lithium Dual-Storage batteries can be professionally restored to full health! > **⚠️ PLEASE NOTE:** This is a **Repair Service** for your existing battery. You ship your unit to us, we fix it, and we ship it back. **We are not selling a physical battery. Buyer responsible for shipping the items to us and including the prepaid return shipping label.** ### 🛠️ Why Choose Our Service? ### We specialize in the complex electronics found in BMW’s LiFePO4 (Lithium) systems. Our service is designed to be transparent, fast, and reliable. - **Expert Diagnostics:** We identify the root cause, whether it's a board failure or a cell imbalance. - **Component-Level Repair:** We replace defective internal components using high-grade parts. - **Rapid Turnaround:** We aim to have your battery tested, repaired, and back in the mail within **48 hours** of arrival. - **Friendly Support:** Not sure if this is what you need? Message us with your VIN, and we’ll help you confirm! ### 📋 Common Symptoms We Fix: ### - "Battery Fault" or "Energy Management" dashboard warnings. - Malfunctioning Start/Stop system. - Battery failing to hold a charge or accept energy recovery. - Communication errors between the battery and the vehicle’s ECU. ### 📦 How the Process Works (Step-by-Step) ### 1. **Purchase:** Buy this listing to secure your spot in our repair queue. 2. **Pack:** Securely wrap your battery in bubble wrap or dense foam. (These units are sensitive!) 3. **Ship:** Send your battery to the address below. 4. **Repair:** We perform the magic! Most repairs are completed within 2–3 business days. 5. **Return:** We ship your fully functional battery back to you, ready for re-installation. **Supported / Interchangeable Part Numbers** - 61 21 5 B3F 325 → 61215B3F325 → 5B3F325 - 61 21 5 A8D 7E0 → 61215A8D7E0 → 5A8D7E0 - 61 21 5 A4A F23 → 61215A4AF23 → 5A4AF23 - 61 21 5 A46 EA1 → 61215A46EA1 → 5A46EA1 - 61 21 5 A38 DE7 → 61215A38DE7 → 5A38DE7 - 61 21 5 407 8B0 → 612154078B0 → 54078B0 - 61 21 9 857 516 → 61219857516 → 9857516 - 61 21 9 442 935 → 61219442935 → 9442935 - 61 21 9 857 095 → 61219857095 → 9857095 - 61 21 9 857 160 → 61219857160 → 9857160 - 61 21 8 795 112 → 61218795112 → 8795112 - 61 21 9 399 992 → 61219399992 → 9399992 **🔋 Battery Specification** - Voltage: 12 V DC - Type: Lithium-Ion Dual-Storage Battery - Capacity: Approx. 10 Ah - Function: Auxiliary / Dual-storage for start-stop & energy recovery - OEM Manufacturer: BMW Group **🔧 Common Issues We Repair** - "Battery Fault" or "Energy Management" warning - Start/Stop system inactive or malfunctioning - Battery not charging or holding charge - Communication or control board failure - Voltage imbalance or capacity degradation **🛠️ What This Service Includes** - Diagnostic testing and component-level repair - Replacement of defective internal components - Average turnaround: 2 business days after we receive your battery **🚗 Compatibility (2017–2025)** BMW G20/G21 (3 Series) \| G30/G31 (5 Series) \| G11/G12 (7 Series) \| G05 (X5) \| G06 (X6) \| G07 (X7) \| G42 (2 Series Coupe) \| G22/G23/G26 (4 Series) \| G32 (6 Series GT) and other BMW models using 12 V lithium dual-storage systems. ✅ Not sure? Send us your VIN — we’ll confirm compatibility before you ship. ### 💰 Our "Peace of Mind" Policy While we have a very high success rate, some batteries suffer from catastrophic internal damage or "burned" logic boards that cannot be safely repaired. - **If we cannot fix it:** We will issue a **full refund** of the service price. - **Return Shipping:** The customer is responsible for the return shipping cost of non-repairable units. **Questions?** We’re here to help! Send us a message for a quick, friendly response. **Note:** This listing is for a **technical service only**. No physical battery hardware is included in this price.

• Brand: BMW
• Type: Lithium Ion Battery
• OE/OEM Part Number: 5A46EA1, 5A38DE7, 54078B0, 9857516, 9442935
• Voltage: 13.2v
• Model: BMW X7
• Manufacturer Part Number: 5B3F325, 5A8D7E0, 5A4AF23, 5A46EA1
• Ampere-Hours: 10ah
• Superseded Part Number: 61215A38DE7, 612154078B0, 61219857516
• Country of Origin: Germany