95% MORE RUNTIMEPowers DCD701 drill for 65 mins (vs. 33 mins on 2.0Ah DCB122) finish attic wiring without ladder climbs. LEGACY TOOL RESURRECTIONRevives 'dead' DCB120-2 tools showing 'LOW POWER' errors no firmware lockouts. ALL-SEASON READYOperates at -4°F/-20°C (OEM cuts off at 14°F) Wisconsin electrician-tested. FAST CHARGE SUPPORTFully recharges in 45 mins with DEWALT DCB115 charger (OEM 4Ah: 70 mins). DROP-PROOF DESIGNSurvived 8 ft concrete drops (UL test) + IP54 rating for dusty crawl spaces.