I am considering building a 12v DC UPS for network equipment, and found this other question which contains a description of how one might build such a device. It suggests:
A Buck DC/DC converter handling charging, but a simple LM317 could also be used, especially if the battery is stored at a fixed temperature, (look up "SLA charger lm317).
The suggestion that a buck converter alone could be used for this purpose makes it sound like the battery would always be connected to the power source.
- Will this damage the battery or create a safety hazard?
- How would you determine the output voltage to set on the buck converter?