Maintenance-free, rechargeable sealed lead-acid battery. Can be used in any position and trickle charged for long periods of time. Will not leak. 2.55" x 5.95" x 3.8" high. 0.1875" quick-connect connectors. ** For any questions: Feel free to chat us. Our customer service rep will be answering all queries from Mondays-Friday 9am - 6pm **