Features of the Makita BL1830 Battery: 

40% lighter
2000+ cycles
430% more run time
22 minute charge time
The long-lasting Lithium-ion batteries are 40% lighter than a similar Nickel Metal Hydride (Ni-MH) battery.
Lithium-ion batteries feature a high energy density technology that will deliver 430% more working capacity during the lifetime of this battery compared to traditional Ni-Cad batteries.
Lithium-ion batteries have an extended length of time during which they hold their charge and even after a long period of storage the batteries will deliver their power.