On 3 Nov 2005 at 22:24, Rob Smith wrote: > I believe this is because NiMh batteries have low internal resistance. Thus > they > are able to provide high (or at least sufficient) current to meet the cameras > operational needs until they have discharged sufficiently to reach the voltage > threshold at which the camera ceases to function. This characteristic means > that camera operation is normally reliable until cutoff threshold is reached, > in > fact you might criticise the D for having rather too high a cutoff threshold > and > hence 'wasting' battery capacity.
True, and according to the spec sheets for my Sanyo 2500mAh AA Ni-MH batteries it pays to ensure that they go through full charge/discharge cycles. Contrary to marketing blurb Ni-MH batteries don't provide an optimum discharge curve or internal resistance unless they are properly exercised :-) The following document is a very informative and interesting read: http://www.sanyo.com/batteries/pdfs/twicellT_E.pdf Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
