Post #22Yes, that's right, but the bit about equalising the voltages by running the engine wasn't in post 7.
You can build up a very comprehensive reply on just about any subject if you concatenate enough different posts.Post #22
"... the typical 12V socket is rated at 120W/10A, but for the purpose of maintaining the battery, it is more like 1A or so draw tops, so pretty insignificant in power terms. You might get more than that initially if the starter has been left to discharge for a while. In that case if you want to go belts and braces, start the engine and run it for 15 mins or so to just boost it before plugging the lead... "
Now you're making me feel dizzy
OOps see what You mean still can't get to much of a good money saving idea