I recently took the batteries out, removed the slide/tray and cleaned all the acid corrosion off with baking soda solution. Rinsed and dried good, then primed and repainted the tray.
Just be sure you mark all the cables so you are sure where to reconnect them.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired