>Either he bought some bad batteries, the temperature was lower than he mentioned >(batteries would "recover: when warmed) or there is a major problem with his F5. Alaklines loose their power it is not generally speaking to recover this lost power, particuly if you have had the batteries exposed for a while, I speak from experince here, having used my F4 and F5 at temps lower minus 20 degrees centigrade. >Over the long haul the MN30 is probably the least expensive battery >solution. Lithium are very expensive, alkalines will give more bang for the >buck. The MN30 also has the additional benefit of being "environmentally >friendly" if that matters. In the long run buying the MN-30`s is cheaper. That is if you can get the chrager and the batteries at a good price, unlike here in the UK. Being enviromentaly friendly is extremely important, think of all the chemicals used in the process of your photography. >Does anyone know the corresponding battery voltage that the F5 battery >indicator should be calibrated to? When you send you F5 back for reprogramming the battery sensor is recalibrated to work at a lower mA. For more information on the F5 battery issues 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