Features and Benefits:

• Performance: The BL2012 20V 2.5Ah battery delivers 95% longer run time than its predecessor the BL2005 (That's over 221 lug nuts when used with the W5130!). At the same size and weight as the previous model, you can get more work done on a single charge.
• Durability: The intelligent Battery Management System (BMS) allows the battery to communicate with the tool and charger to offer triple battery protection prevent over loading over charging and over discharging for longer tool and battery life.
• Versatility: The BL2012 batteries slim design allows you to go further with less in your way. Its light weight doesn't compromise power letting you keep working on big jobs with a slimmer tool.
• Battery Fuel Gauge: 4 light positions
• Quick charging feature in one hour or less.