^^ I did this on my 182FF. It was a complete @rse to get out owing to the lack of space in that area. Unclipping the headlight wire and it's plastic clip freed up just enough space to get it out. The lump weighs 2.5kg iirc. Can also get rid of plastic engine cover, underbonnet felt, engine hoists and possibly fuel rail cover. Lightweight battery could save 10kg from the n/s side of engine bay.