The Technician Issac was excellent but the follow up was terrible. I called after taking the car for a ride afterwards and experienced multiple issues and no one called to follow up. Now I have to take it to a dealership for analysis because I lost the entire instrument cluster. Google shows hundreds of issues: Yes, it's not uncommon for drivers to notice unusual behavior in their cars after replacing the battery. Here are some potential reasons for this: 1. Electrical System Reset: When a battery is replaced, the car's electrical systems might reset. This can lead to temporary issues such as the radio needing to be reprogrammed or the clock needing to be reset. 2. ECU Relearning: Modern vehicles have an Engine Control Unit (ECU) that may need to relearn certain parameters after a battery change. This can cause changes in performance until the ECU adjusts. 3. Faulty Connections: If the battery terminals are not connected properly, or if there's corrosion, it can lead to poor electrical connections, causing various electrical components to malfunction. 4. Compatibility Issues: If the new battery is not compatible with the vehicle's specifications, it can lead to performance issues.