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Rechargeable Sealed Lead-Acid Battery Ot7-12. Sealed Maintenance-Free Design: Completely sealed structure requiring no maintenance for safe and easy use. High Quality Assurance: 100% pre-delivery inspection ensures consistent quality and performance. Low Self-Discharge Rate: Strong charge and discharge ability with minimal power loss during storage. Versatile Application: Ideal for UPS, electric bicycles, boats, and various industrial backup systems. OEM Customization Available: Supports custom logo and picture printing on battery cases upon request.