rob, if you mean can you use any battery charger to manually charge
your batteries...sure.  i do it all the time.  when i pull the
batteries out of the MH at the end of the season i charge 'em up once
a month.  but if you want your batteries to charge while plugged in to
shore power then you'll need to install an automatic charger.  

73,
rich, n9dko

A "battery charger" in an RV is called a "converter".

A standard battery charger doesn't have the capacity to produce enough
power for typical RV needs; nor does it produce clean enough power for
RV applications.

What you really need is a converter, such as the 55 amp Parallax unit
sold by Camping World under catalogue #14839 for $190. It not only
supplies clean DC power, but enough amperage to look after day-to-day RV
needs under continuous RV usage conditions.

I see where "Rob" <bucfan11SPAM@earthlink.net> contributed:

Yes, you can.   I replaced a converter in one of our rv's with a
charger.   The only caution:  unlike the typical rv "converter", the
charger will not support continuous drains in excess of charging
capacity.

Will Sill
"Those people who will not be governed by God will be ruled by
tyrants." Wm. Penn