ALiEn2 plunger lift controllers contain software that actively monitors the attached battery to determine when to go into a low battery shutdown to ensure the controller can perform critical operations and safely shut down.
Battery Monitor Operation
Low Battery
If 6 successive battery samples are below 5.5 V, the controller enters the “Low Battery” state. A low battery alarm condition is recorded, which is reported in the history.
Normal Battery
If 6 successive samples are above 6.0 V, the controller enters the “Normal Battery” state. When entering the Normal state, the controller will restart in the Close state for the duration specified by the Close Time parameter.
Battery Charging
Please refer to this article on charging a battery.