I have a simple question I hope): My cordless phone handset works with two 1.2V rechargeable batteries, but the DC converter that comes with it and that is supposed to recharge the batteries has a 9V DC output ! How come ? Is it applying 9 V to recharge two 1.2V rechargeable batteries ?! Or perhaps the 9V go only on the charger (where sits the headset to be charged) and the charger applies only the appropriate voltage to the batteries, that is around 2.4 V. But then why so much voltage (9 V) for the charger ?!