How to charge shimano grx di2?

To charge the Shimano GRX Di2 electronic shifting system, follow these steps: 1. Remove the battery: Locate the battery on your GRX Di2 system. It is usually located beneath the bottom bracket or within the seat tube. Use the appropriate tool to remove the battery. 2. Connect the charger: Take the charger provided with the Shimano GRX Di2 system and connect it to the battery. Ensure that the charger is securely attached. 3. Plug into a power source: Plug the charger into a standard wall outlet or any other power source that is compatible with the charger. 4. Charge the battery: The charger will start charging the battery. Check the battery's LED indicator to see the charging progress. It may take a few hours to fully charge the battery, depending on the current charge level. 5. Disconnect the charger: Once the battery is fully charged, disconnect the charger from the power source and the battery. 6. Reinstall the battery: Carefully reinsert the fully charged battery back into its designated location on the bike. Remember to follow the manufacturer's instructions and safety guidelines provided with your Shimano GRX Di2 system for the best charging practices.