Q: What is the (maximum) discharge depth recommended for the equipment to work while maintaining the reliability of the measurements?
A: It depends on the power draw of your sensor, but its best to stay above 2.95V*
The batteries supplied by use can be deep discharged to 2,5V* for at least 2000 times.
*These values relate to the LiFePO4 Battery, not to the Minimal Voltage required for the Data Logger.
T: To calculate Power Usage, use our Power Consumption Calculator. (It can be found here).
T: Batteries should always be removed when the data logger is withdrawn from the field and (temporary) stored in a dark environment like a cupboard.
This is why: The power board is switching off power deliverance to the data logger at 2,5V, that level is marked as “empty” for this battery type.
But… After switching data logger power off, the detection circuit on the power board is still consuming a little bit of power and depleting the already (marked as) empty battery.
T: Below 2,5V, no charger will charge the battery. There is a trick: Try to carefully and shortly, load the battery with a 3,7V /(low current, like 0,2A) using a adjustable power supply, to level-up the voltage from the empty battery to 2,5V. If that succeeds, the battery can be recharged.
If the voltage keeps below 2,5V, it has gone defect. The charger will not detect that the battery is capable of charging.