>The temperature was close to 32 F. But this is not cold. -20 F is cold. I put in new batteries, and all was fine. I am using Alkalines. Don`t use Alkalines in all honesty it wasn`t designed for them, use Lithiums or the MN-30 battery. >So, I see 3 causes >1) battery drainage Nikon problem - but this problem has been known for a long time and should have been fixed. My serial # is 3114130, bought 1 month ago. The production of the F5 has not chnaged at all since its introduction. If you plan to use Alkalines all the time then send/take you F5 to a service facility and get it reprogrammed via the DX contacts to adjust the battery level meter calibration. This will add 8-10 rolls to the total. At 0 Degress Celcius Alkalines loose half their power, which cannot be restored. Lithiums, however, as with the MN-30 will happily function to -20 degree centigrade. >2) battery drainage when camera ON but not used - isn't this really 1) ? The F5 will not drain the camera while in ON mode, only if the meter is active. >3) crap batteries. These I bought from the camera store, they have a less known name. I should try Energizer/Panasonic/Duracell perhaps? I have only used >this one brand since I bought the camera. Many Nikon approved distrubutors send there F5 boxed with Lithiums now. The F5 wasn`t really designed to run on Alkalines. Canon have been using Litiums for years. If you plan to use Alkaline think of all the spent batteries you`ll put in the bin, that end up in land fill sites and aren`t enviromentally friendly regardless of what it says on the box. >Has anyone seen a problem with (a recent serial#) F5 draining the batteries? As above, no matter what serail number you buy the probelm is the same. For more information on the F5 battery problem see: http://www.jpgservices.ndirect.co.uk/battery.htm -- JPG Photography Professional 35mm Photography [EMAIL PROTECTED] http://www.jpgservices.ndirect.co.uk Call: (+44) (0)121 602 1901