Replacement battery fits 5 Hypercom compatible models. Specifications: 1800mAh, 7.4V, Li-ion. Compatible with: M4230, T4230, T4240, T4220 EFT, M4240. Replaces: Hypercom 400037-001, Hypercom 400037-002. Hypercom replacement battery designed for Payment Terminal devices. Built to OEM specifications for reliable performance.