Replacement battery for Credit Card Reader. Specifications: 1800mAh, 7.4V, Li-ion. Compatible with: Credit Card Reader. Replaces: FD-400, FD-400GT, FD-400TI, FD400GT Wireless Terminal, FD400Ti Terminal, First Data FD-400 and 1 more. First Data replacement battery designed for Credit Card Reader devices. Ensures your device stays powered through regular use.