Using notebook batteries as a no-break (UPS) for a desktop

Question

I have a notebook battery at home that became useless when my old notebook died (RIP). Can I use the battery in some way to implement something like a no-break (also known as UPS (Uninterruptible power supply)) for my father's desktop?

I know that I could have a really low break-energy safe time, but it would be really useful in the case that my father doesn't have a no-break/flywheel backup and I have a useless battery.

The main idea is to give some useful afterlife to this part of my old notebook. Is it possible to aggregate some control circuit with a notebook battery to the desktop's SMPS (Switched-mode power supply)?

Answer 1

Probably not since the voltages are not similar. From the link below:

A Li Ion pack consists of a number of the series/parallel connected cells (typically from 4 to 16) to provide the required operating voltage and current levels. Nominal voltage of each cell is typically 3.6-3.7 V, the charging voltage is about 4.2-4.3 V per cell. The Li-ion phosphate cells have 2.9V nominal and 3.6V charging voltage. Note that because of the cell's relatively high voltage, many low-power portable products can operate from a single cell. Depending on the cell connection scheme, the nominal Lithium Ion battery voltage for a laptop computer can vary from 7.2 V to 14.8 V (typical voltages for major brands are: 11.1 to 14.8 V for Dell laptops, 10.8 to 14.8 V for Toshiba, Apple, Gateway and IBM laptops, 7.4 to 14.8 V for Sony, 7.2 to 14.8 V for HP, 14.4-14.8 V for Compaq). Note that the output voltage rating of a laptop power supply is not necessarily the same as nominal battery voltage.

http://www.smps.us/battery.html