If the voltage drops to between 12.0 to 12.4 volts, the battery is considered weak, suggesting it may struggle to start the vehicle. A reading below 12.0 volts indicates a bad battery. At this level, the battery is unable to hold a charge effectively and may need replacement.
The Lenovo Vantage app has got battery threshold settings in it, I recommend that over utilities from who knows where If you often discharge your battery to near empty (< 20%) then start charging at 95% and stop at 100% If you frequently use the battery but don't fully discharge. Usage between 50% and 100% then start charging at 75% and stop at 80%
When a battery drops below this voltage, it may not have sufficient power to start the vehicle. According to Battery University, the nominal voltage of a fully charged 12-volt battery should be around 12.6 volts. Regular checks ensure batteries remain charged and functional.
A reading between 12.4 to 12.6 volts suggests that the battery condition is fair, implying it may need charging soon. If the voltage drops to between 12.0 to 12.4 volts, the battery is considered weak, suggesting it may struggle to start the vehicle. A reading below 12.0 volts indicates a bad battery.
If the voltage falls to around 11.8 volts, the battery is in a state of discharged failure. Continuous operation at this low voltage can damage the battery, leading to premature failure. Additionally, extreme low levels, like 10.5 volts or lower, could prevent the engine from starting altogether.
but rather why there's no benefit in discharging the battery to low-voltages Great answer, I would add one thing - if the load is high (2CA or more), then I would consider 10.5V as the lower limit. Some USPs do that too. Open circuit voltage is usually higher than that, but I cannot really disconnect the load to just measure the voltage.