The Max USA RB517 Cordless Rebar Tier REDUCES TYING TIME. About 5 times faster than manual tying. Makes ties in less than 1 sec. per tie with consistent tie strength. High speed tying saves you time and money. LI-ION HIGHER CAPACITY BATTERY - Thanks to the Lithium-Ion battery technology the Max rebar tier RB517 ties approx. 1800 ties per charge which is 5 times more than Ni-Cd model. Less charging time means more productive work in the job sites. Also Lithium-Ion battery is free from Memory Effect so you can charge the battery whenever convenient. BRUSH-LESS TWISTING MOTOR - The brush-less electric motor offers higher efficiency and longer lifetime. It increases ties per charge by 35% comparing with older model motor and does not require service caused by brush erosion or dirt on commutator.