Luqmaan Pattisahusiwa on Instagram: "W211 Battery Check HACK! 🔋 Save yourself time/money and keep your W211 running strong this winter! ​You don't need to pop the hood to check your battery's health. The W211 has a secret built-in diagnostic menu for the main battery voltage! This is crucial before winter hits. ​This check is also a great way to monitor your alternator output while the engine is running. A healthy alternator is key to a long battery life! ​💡 Quick W211 Battery Health Guide: ✅️