Never fully discharge the LiPo battery. The usable voltage range for a standard LiPo battery individual cell is3.2v to 4.2v. Any lower than 3.2v and the battery may be permanently damaged. Any higher than 4.2v and you significantly increase the risk of a battery bursting into flames. To determine the minimum voltage of a battery pack - multiply the number of cells by 3.2 for its total minimum voltage.
If the voltage in a LiPo battery drops below the minimum charge - at that voltage LiPo cells suffer permanent damage.
Lithium polymer (LiPo) batteries do not need to be fully discharged before charging. Discharging them below 3.2v volts per cell can permanently damage them. Many chargers won't even allow charging if the voltage is below 2.5 volts per cell.
The Home Original battery has 3 cells
The nominal voltage of the home Original is 11.1V (3.7v*3 cells). A fully charged 3S pack is 12.6v and a fully discharged 3S pack is 9.6v. If the battery is allowed to discharge fully it is permanently damaged and will refuse to charge. It needs to be disposed of.
The Home Plus battery has 4 cells
The nominal voltage of the home Original is 14.8V (3.7v*4 cells). A fully charged 3S pack is 14.8v and a fully discharged 3S pack is 12.8v. If the battery is allowed to discharge fully it is permanently damaged and will refuse to charge. It needs to be disposed of.