I'm working on a project where mains voltage will sometimes be disconnected, and the system will have to run on battery for as long as possible before doing a (safe) shutdown. The desired behavior is exactly like a laptop battery system:
- When mains voltage is connected, charge the battery and power the system from mains
- When mains voltage is disconnected, power the system from the battery
- Prevent the battery system from supplying current when the batteries are discharged below a certain voltage (to prevent damage).
Is there a name for this type of system, or a name for the feature(s) that I should be looking for when I look at chargers? (If it matters, this system will be 12V, so I'm looking at 14.8V Lithium battery options.)