Using the Shimano Steps BT - E8035 battery is easy. First, make sure it's properly installed in the down - tube of your bike, using the double - ratchet removal mechanism for a secure fit. When charging, connect it to a compatible charger. Keep in mind that the battery has a high level of water - resistance (IPX5), but it's still a good idea to avoid submerging it in water for long periods. For maintenance, regularly check the connections to ensure they're clean and tight. Store the battery in a cool, dry place when not in use. If you notice any issues with the battery's performance, it's best to consult a professional.