1. High-quality ABS+PC material, strong and tough, good flame retardant performance;2. Double-layer waterproof cover design, with very good airtightness;3. Copper nuts are used for the outlets, and screws are required to purchase this battery;4. Humanized carrying strap design. At the same time, the carrying strap is fixed with embedded and screw double fixing methods, which is more firm;5. This model can hold 180 18650 batteries, 9 series 10 parallel or 10 series 9 parallel double layer, 60V20A 72V20A lithium ion battery;Colour:blueMaterial:ABS+PCSize:225 x 200 x 170MMinternal : about 220x195x165MMPackage Contents:1 x Battery caseOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.