UPBRIGHT 230W OEM AC Adapter For Compaq 8440p i7-640M, i7 620M, i5 540M, i5 520M, Compaq 8540w i7 840QM, i7 820QM, i7 740QM Battery Charger Power Supply Cord

Low interference and noise Advanced technology and high quality High efficiency and reliability World Wide Input Voltage 100-240VAC 50/60Hz. OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection). Tested Units. In Great Working Condition. This product is a compatible third-party accessory.UpBright 30 days money back guarantee. 1 full year service warranty. Tips: Rechargeable batteries don't last forever, the average battery last 1 to 3 years. If the battery is old/dead, it will not accept a charge. But not charger's problem. If you're not sure whether battery or charger is dead or not. You must have a volt meter in order to tell whether or not a charger is working.