This is a genuine Makita BL1840 18V Li-ion battery with 4.0Ah capacity. It has been used but still functions perfectly and is in great working condition. The battery technology used is Lithium-Ion (Li-Ion) which ensures long-lasting and high-performance battery power. The unit type is a unit and the voltage is 18 V. The battery is compatible with various Makita power tools and is an essential accessory for any DIY enthusiast or professional tradesperson. The battery comes in black colour and is a great addition to your workshop equipment.