Exhausted on Digital Camera but OK for
When ultimate lithium AA batteries show out of charge on my Pentax digital SLR camera, they still show as 'good' on my battery tester and work in a flashlight. Why is this?
A flat battery has a high internal resistance. It can still work at low current, for a device that doesn't take a lot of whack. It is like having a resistor connected between the device and the battery. A radio can often run on flat batteries - I used to collect them for this purpose. Reason - a radio uses a few milliamps and a digital camera is a television camera, it takes a few amps. So the digital camera would cause a flat battery to drop the voltage down to nothing, the radio wouldn't.
8 months ago