Four Halcyon 1800 mAH Lithium Ion Replacement Battery for Sony HDR-CX240 Full HD Handycam Camcorder and Sony NP-BX1 Package Includes: 4 Halcyon Brand Battery Battery Specs: 1800 mAh with Premium Japanese Cells Halcyon Support: Includes 5 Year Halcyon Replacement Warranty. Full Membership Access to Halcyon Customer Support Website Frustration Free Packaging. No wasteful and dangerous plastic blister packs. Compatible with all cameras which take Sony NP-BX1 Batteries