[Batteries in portable equipment]

Hey,

here is more information:

The device will be a braille decoder to be used inside a classroom in school. It will send data via Bluetooth to a computer. Expected use is about 4 tot 8 hours a day.
Voltage is not yet determined as we have not set the specs yet of the device, it will either be:

3V8 and 3V3 => power supply 40mAh

or

3V6 to 4V9 and 5V continuous (for USB) => power suply 125mAh

[Batteries in portable equipment]

Hi,

I am designing a portable device that will run on batteries.

What type of batteries would you generally recommand? Capacity (battery life) is most important factor.

regards