Replacement battery fits 8 FirstData compatible models. Specifications: 1800mAh, 7.4V, Li-ion. Compatible with: FD-400, FD-400Ti, FD-400Gt, FD-410, FD-400GW, FD410DW and 2 more compatible models. Replaces: FirstData FD400. FirstData replacement battery designed for Payment Terminal devices. Designed to match the original manufacturer’s performance.