I have always purchased all my chargers from Maplins.Some of them are ten years old now and still perform well .Their in store customer service is excellent.Just take whatever diagnostic tool along with you and as often as not they will even let you power the tool up .Just make sure that that whatever charger you get is rated at least 1amp .I have kitted my MD802 out with a mains and a ciggy lighter socket charger for under 20 quid.And the other good part is you get a range of adapters giving you many options to power up any other kit you may have.