A residual discharge current is especially dangerous if the system has been discharged all the way until a low cell voltage
shutdown has occurred. At this moment the state of charge can be as low as 1%. The lithium battery will get damaged if any
remaining current is drawn from the battery. This damage can be irreversible.
A residual current of 1mA for example can damage a 100Ah battery if the battery has been left in discharged state during more
than 40 days (1mA x 24h x 40 days = 0.96Ah).
The battery monitor draws <1mA from a 12V battery. The positive supply must therefore be interrupted if a system with Li-ion
batteries is left unattended during a period long enough for the current draw by the battery monitor to completely discharge the
battery.
In case of any doubt about possible residual current draw, isolate the battery by opening the battery switch, by pulling the battery
fuse(s) or by disconnecting the battery positive when the system is not in use.
Manual - SmartShunt
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