When I was doing those Nimh tsts I also mesured the amperage of the cells, the best alkaline battery testd at 1.6V 40~50 ma, a 1600 mah nimh battery was 1.3v 130-140 ma, now remember your puttting 4 of these in a fg battery pack, so 4 regular or rechargable alkalines will provide 160-200 ma to the camera, now 4 nimh or nicads are powering 560 ma to the camera, if they built it to be powered by a higher voltage lower amperage source and you double/triple the apmerage it is only a matter of time before you burn something in it. No rechargables in my MZ-3, the flashes can use them all they want, since I change the AA's in the MZ-3 every 3 months but the flahses nightly
--- Kent Gittings <[EMAIL PROTECTED]> wrote: > Having been in this field longer than your brother I > think you may have not > posed the correct question. We aren't taking about > voltage but the amount of > current a given battery technology can sink across a > give load value. A > circuit has the same amount of current flow as long > as the ohm value of the > load and the voltage of the source remain constant. > However in a camera the > load seen is high (low current) when only the > metering is operating. When > the motordrive kicks in the power source has to be > able to increase it's > current flow to power the startup torque and running > of the motor. The only > way to do this is to suddenly have the battery see a > lower load (fewer ohms > of resistance). Various battery technologies have > different peak current > supply capabilities. If the camera maker wants to > use this as part of the > protection circuitry of the camera they will specify > a limited battery type > for the camera. Using rechargeables is only a > problem in the voltage area if > the electronics need to run close to the voltage > produced by x number of > alkalines or other specified types. If the camera > has power regulation down > to a something like 4 volts from 4 AA alkalines then > 4 NiCads at 4.8 will > work. > On the otherhand if the camera maker says not to use > NiMH or Lithium-Ion > batteries it generally means that prolonged use of > higher current capable > battery technologies will eventually burn out some > of the electronics > because they were using the source current limit as > part of the design > process. Especially if the manual says something > like "use of battery types > not specified can void the warranty". > Kent Gittings > ______________________________________________________ Send your holiday cheer with http://greetings.yahoo.ca - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
