Hi @Frosted  Firstly an apology and correction - what I should have said is that "I have an AA solar trickle charger on order that I was going to connect to the OBD socket whilst the car is unattended" - oops!  The one I have on order is the 4.8w version. I have read numerous reviews, the majority of which seem very positive, if it is used correctly. Apparently, a few people have blown fuses by switching on the ignition whilst the charger is still connected to the OBD point. The charger should b