Made with advanced lithium-ion technology, the X3 22Ah battery—front or rear—is lightweight yet durable, allowing you to enjoy extended rides without carrying unnecessary weight. The rear battery kit comes complete with everything needed for a secure and easy installation, including a mounting rack specifically designed for X3 bike frames. What's in the Rear Battery Kit Box? 22Ah Rear battery 2 keys Power supply cable Battery mounting rack Please note: This battery kit does not include a charger. Charging Compatibility: The charger used for the X3 22Ah front battery is fully compatible with the rear 22Ah battery, so you can use the same charger for both batteries. If you only need a single battery, contact customer service to ensure that other accessories are compatible with your eBike frame. This model is available in multiple configurations. Product images are for reference only. All shipments are fulfilled with the latest updated version matching your selected setup. Compatibility Notes: This rear battery kit is only compatible with the Wallke X3 series. If you have an X3 Pro Max and your bike already has a rear battery rack, you may select the option that includes battery only. If you have an X3 Max or X3 Pro, you must purchase the full rear battery kit including the mounting rack. For any uncertainty regarding your eBike model or battery compatibility, please contact our customer service team to ensure you select the correct rear battery setup for your ride.