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I had a small battery charger bolted in place under the bonnet of my 1972 Citroën DS, because I didn't drive it much in winter and I wanted to keep the battery topped off.

nice idea if you have enough space for it :)

Have you ever seen the size of the bonnet of a DS? You can sleep under it, next to the spare wheel 8-).

hahah now I see after I googled it :D


In winter, going only short distance, the battery would be drained all the time.
Diesel Engines can take quite some energy to start in winter.I had what @orcdu said.

Makes sense. It is really nice thing to have in old diesel's. Thanks for commenting!