[Motorola] HT-220 and -500 manuals?

[ersmar at comcast.net]

Gents:

    I have an armful (literally) of HT220's and HT500's that I'd like to
recrystal to the Amateur bands (2M and 440.)  Can someone point me to a
source for manuals (and elements?) for these things?  Also, I'd be
interested in any and all ideas about homebrewing battery sets as well.
I've done a bit of battery improvisation on old military squad radios, so I
am confident this can be done.  Thanks.

73 de
Gene Smar  AD3F
P.S.  I'm new to this reflector and haven't gone through the archives yet.