DBL™ DOUBLE BATTERY LIFE DBL™ DOUBLE BATTERY LIFE Optimize your battery cycles. DBL optimizes charging cycles and increases battery life up to 100%. Standard on IPC high frequency battery charger. Applied to: CT 71 CT 51 CT 81 CT 80 CT 110 CT 160 CT 230 CT 46 CT 40 CT 55 Benefits Extended battery life up to 100%. Optimize the charging cycles. Recharging optimizes only when required.