DeWalt Powerstack Battery | 18V XR | 5.0Ah | DCBP518A revolutionary compact battery with next generation POWERSTACK technology delivers 50% more power, more than 50% more work per charge, and twice the lifetime of standard cylindrical cell batteries. Key Features: POWERSTACK technology next generation of cordless power 5Ah capacity powerful and compact 50% more power faster application speeds, increased productivity More than 50% more work per charge longer runtime Twice the lifetime compared to DCB184