DBL™ DOUBLE BATTERY LIFE DBL™ DOUBLE BATTERY LIFE Optimize your battery cycles. DBLTM optimizes charging cycles and increases battery life up to 100%. Standard on IPC high frequency battery charger. Applied to: CT 71 CT 51 CT 81 712 512 Rider 712 Rider 1050 1250 1280 1404 Benefits Extended battery life up to 100%. Optimize the charging cycles. Recharging optimizes only when required.