I have an autoranging multimeter and many AA batteries.... how do I interpret the readings when deciding to keep or discard AA (1.5 volt) batteries?

I've built a temperature sensor module that runs off of 4xAA batteries and sends data back to a computer via XBee. Works great, until the weather gets cold. At that point, the re …

Hi everyone, Many people seem to run their projects off the mains (e.g. with a wall wart) or from a battery, but there doesn't seem to be too much discussion about how to run a de …

How do I calculate how long a battery operated product will run? Here's what I've got: 2 AA, 1.5V, 2700mAH batteries Voltage Regulator with a Iq of 25 uA Voltage Regulator Eff = …

I'm working on a little sensor platform that runs off of batteries. I'd love to be able to trigger an alert when the voltage gets too low. The problem is that anything I use to m …

I'm looking to make a battery life indicator that I can use in conjunction with a micro-controller. I'm hoping that I can then read the current battery life remaining and increasin …

Are there any special requirements for charging lead-acid batteries? Cheers, Marcus

I am looking to power a PIC microcontroller with a supply voltage that ranges from 4.5V to 18V. This will be a battery powered device so I would like to conserve power, ie. linear …

I am running a battery powered device, and would like my microcontroller (PIC) to report on the supply voltage. This is so I can determine how many batteries is used in the supply …