Chris Leck , Jun 19, 2006; 09:59 p.m.
When a battery is at or near empty, I charge it. It then goes into my camera bag until rotated back into use. This could be a few hours or, sometimes, a few weeks. I have some EN-EL3 batteries that are well over three years old and working fine, so I've been using the same routine with the EN-EL3e batteries for the D200.