Shimano di2 how to charge?

Shimano Di2 is an electronic shifting system for bicycles that provides smooth and precise gear changes. It does not require charging as it is powered by a separate internal battery. The battery can be charged using a Shimano Di2 charger, which is typically included with the system when purchased. To charge the battery, you would need to connect the charger to the Di2 junction box, which is usually located near the bottom bracket or within the handlebar stem. The charger will indicate when the battery is fully charged, at which point it can be disconnected and the system is ready to use again. It is important to note that the battery life of Shimano Di2 can vary depending on usage, so it's a good idea to regularly check the battery level and charge as needed to ensure optimal performance.