Boost voltage

[Claudio L.]

(06-04-2015 02:31 PM)Hlib Wrote:  The HP-corporation will never provide you information on the resistor which needs to be replaced in the scheme for change of a threshold of shutdown

As far as I understand, the 50g battery indicator is fully controlled by software. It has Vcc connected to one of the A/D inputs, so you can read the voltage through the A/D converter and make a decision whether you want to turn off the device, show an alarm to the user, etc.
However, I don't think it's safe to use the batteries all the way down, as the device could reset at any point and may cause data corruption.
This is also true for the new booster device shown in the original post. If you fool your calculator into thinking you have good batteries when you don't, all you are doing is risking your precious data. Is the extra 20% energy you'll get from your batteries worth the risk? Probably not.

For other devices (toys, remote controls, etc), I think that voltage booster is a great device.