NIMH cells vary widely in their acceptance of long term overcharge (trickle= ). Some specify that you shall never charge them this way. Others will accept a C/10 overcharge without damage. The difference is in the exact construction of the cell, determining how well it handles the resulting free oxygen and hydrogen. Because of this wide variability, one should not generalize. Olin is correct, go to the web site, find the data sheet, and read it. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .