In regards to some of the tank circuit / backup setups I have been reading about. Is there a software/hardware method out there for status of the backup battery? Something like the control panel's Power options, that could determine the state of charge of the battery (I would assume by an assigned constant(capacity) and discharge rate over time (like an Amp-hour meter, only software). It could even determine battery capacity periodically during a test discharge/charge. Obviously hardware would have to be a bit more complex. I figured this isn't necessarily new territory for ups. But I've never owned one.