[Icom] replacing battery on ic 781 tip please

[icom@mailman.qth.net]

hello 
can any one can give me any tip how to replace the time battery on my 
IC 781  what i have to look out and so and 15w soldering iron with 2.0 mm
is OK to use?
please any good information 
all the best many thanks 
Roberto T


--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
Please post in Plain-Text only.---