Battery reached the end of its cycle life? Need to put in a long session under the hood but a single battery can’t last long enough? Solve problems like these with the STEELMAN 61031 Rechargeable Li-Ion 3.7V 6000mAh Replacement / Backup Battery Pack. This lightweight power cell can replace either a dying battery whose charge cycles are used up or can be easily carried in a pocket or work bag and swapped out when the current battery’s charge runs low so you can keep going longer. Designed with Li-Ion technology, this battery provides high energy density along with fast and efficient charging and a low self-discharge rate so they will always be ready for use. Compatible with the STEELMAN 61030 280-Lumen Slim Bar LED Tire Jim Light and comes fitted with all necessary connecting wiring already in place for a quick swap out.