Yes, it is possible to charge a motorcycle battery without removing it from the motorcycle. There are two common methods for charging a motorcycle battery while it is still installed in the bike:
Battery Tender/Trickle Charger: A battery tender or trickle charger is a device specifically designed to charge and maintain the charge of a battery over an extended period. It is connected directly to the battery and uses a low charging rate to avoid overcharging. You can connect the battery tender to the motorcycle's battery while it is still in the bike, usually through the charging port or by attaching the alligator clips to the battery terminals.
Portable Jump Starter with Charging Function: Some portable jump starters come with a charging function that allows you to charge the motorcycle battery without removing it. These devices typically have a built-in battery and cables to jump-start the motorcycle, but they also provide a charging capability. You connect the jump starter to the battery while it is still installed in the motorcycle, following the manufacturer's instructions.
It's important to ensure that you use a charger suitable for motorcycle batteries and follow the instructions provided by the manufacturer to avoid any risks of overcharging or damaging the battery. Additionally, it's recommended to charge the battery in a well-ventilated area and monitor the charging process to ensure the battery does not overheat. If you're unsure or uncomfortable with the charging process, it's best to consult the motorcycle's manual or seek assistance from a professional.