Okay. The battery in the freezer trick did not work again
so I suspect that my Z problem is either the battery or the battery charging circuit. I need to work out a way of charging the battery away from the Z. I also have a multimeter << but I don't understand the readings.... but when it is on V at the 200 mark I get a reading of 2.3. When I touch the Z (golly. I really don't understand what I am doing here!!) the reading is 2.1 (no changing any settings on the multimeter). Does anyone have any guidance on this? I want to know whether the problem is the battery, the charging circuit or my power supply. Thanks.
edit : I have just taken some more readings. the battery has been on charge in the Z for an hour and it reads 2.65 .......the ac on the Z reads 4.1. I am charging via USB. I do not have a Z charger. Could it be that the battery is not getting enough of a charge??