To save the battery from being deep discharge / completely discharge it is better to disconnect the battery from the load as soon as it reaches to its threshold voltage, by doing this the battery can be prevented from completely discharge & provides long term durability.
The project shown here can be used effectively for this purpose and it can be used with all types and voltages of rechargeable batteries for example lead acid, lithium ion, NiMH and all other types of rechargeable batteries & any voltage batteries like, 3.6V, 6V, 9V, 12V or any voltage battery made with separate 1.2V or 3.6V rechargeable cell. The circuit will monitors a battery pack or battery and disconnects it with the load when it will reach at the threshold voltage set by the 100K pot.
After you have completed building the circuit it will require some calibration for the first time for doing so first disconnect the battery from the circuit and connect an adjustable power supply in the place of battery and set it at voltage on which you want to disconnect the battery from the load. For example you want to use it for 12V battery then set 11.9V in the adjustable power supply now slightly adjust the trip point / 100K pot until the LED goes off. For 6V battery set 5.9V in the adjustable power supply and connect in the place of battery in the circuit and slightly adjust the trip point until the LED goes off. After this calibration remove the adjustable power supply and connect the battery again. The ON LED in the circuit shows the indication of battery connected with the load and that LED goes off automatically when the battery is disconnected with the load.
The figure below shows an adjustable low battery cutoff circuit for all rechargeable batteries. Rechargeable batteries are very expensive whether it is a lead acid battery, lithium ion battery, NiMH battery or any other type of battery letting them deep discharge or fully discharge makes them completely
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