YTX14-BS 2115410001 Replacement for Mercedes Benz Auxiliary Battery - 12V 12AH Secondary Backup Aux Battery for E350, CLA 250, GLK 350, E320, ML350, E500, CLS 400, GLA 250

IMPORTANT INSTALLATION NOTES:Terminal style: M6 nut-and-bolt posts (not OEM F1/F2).Some CLA250 & E-Class model-years need longer bolts or a small spacer ring.Vent: single top-center port—use a 4-inch extension hose if your factory tube is side-mounted.Disconnect main battery before replacement and ensure tight, corrosion-free connections.Please Note: This is an UpStart Battery Brand replacement part, NOT an OEM product. Ensure compatibility by verifying your vehicle model before purchase.Compatible with Mercedes-Benz:C350 (2008-2015)CLA250CLS400CLS500 (2006)CLS55 AMG (2006)CLS550 (2007-2016)CLS63 AMG (2006-2013)E320 (2003-2009)E350 (2008-2014)E400 (2015-2017)E500 (2003-2006)E55 AMG (2003-2006)E550 (2007-2017)E63 AMG (2007-2009)GL450GLA250GLK350ML350S550SL400 (2015-2016)SL450 (2017-2020)SL550 (2013-2020)SL63 AMG (2013-2019)SL65 AMG (2013-2018)SLC300 (2016-2020)SLC43 AMG (2016-2020)SLK300 (2016)SLK350 (2015-2016)SLK55 AMG (2015-2016)W211

• Compatibility & Fit – Designed to be compatible with Mercedes 2115410001 Secondary Backup Auxiliary Battery, including models E350, CLA 250, GLK350, E320, ML350, E500, CLS 400, GLA 250, S550 and more. (Full compatibility list in the description)
• Fix Common Issues – This replacement for Mercedes auxiliary battery can resolve warning lights, restore Start/Stop and ECO functions, fix SRS malfunctions, improve Brake Hold operation, and prevent low voltage codes that may cause performance issues
• Ready-to-Use – Factory-charged and installation-ready. Uses nut-and-bolt (M6) posts; some CLA250 and E-Class cables may need a longer bolt or 3 mm spacer. Vent port is top-center—attach a short hose if your factory tube is side-mounted. Supports electronics but is not intended for engine cranking.
• Sealed AGM Battery Design – This 12V 12AH YTX14-BS sealed AGM battery is maintenance-free and may not need a vent tube. It does not have a vent port, and if your original battery includes a vent tube, it may not be required.
• Installation Considerations – May require terminal adjustments or connector modifications. Includes nuts and bolts. Secure nuts with tape or silicone and use hand tools to prevent damage. If warning lights persist, check connections and ensure proper installation.