I am going to explain here how to analyze those laptop batteries that are not detected by the laptop (dead/faulty/over-discharged/zero voltage).
As a reminder, NLBA1 Laptop Battery Analyzer is an advanced analyzer and not a repair tool. It has features to revive those laptop batteries that can be revived (PF - Permanent Failure flag is not set).

There are 2 methods: Manually from "Battery Info" tab or Automatically from "Repair" tab

Manual method:

Step 1. Be sure the NLBA1 device is connected correctly to the laptop battery
- if you don't know the pinout of the battery you can follow the steps described in chapter "7. How to identify Battery pins" from manual: https://www.laptopu.ro/Download/Manual/Manual_NLBA.pdf
- do not forget to connect System Present battery pin/pins to GND if the battery has such pin/pins (System Present pin connected the GND informs the battery that it is connected to the laptop, so the battery is enabled)
- press Start Reading button

- if you see Valid Data like in the above image then the communication lines are connected correctly, go to step 3
- if you don't see Valid Data it could be that Battery Chip is not powered (cells are extremely low voltage), go to step 2

Step 2. Set Output Voltage
- this option sets a specific voltage on the green NLBA1 connector (black and red wires)
- this option can be used to power on electronic from laptop battery in case it is dead
- just press Power ON button like in the image bellow

- start reading the battery data by pressing Start Reading button
- if you can see valid data then, go to step 4
- if you cannot see valid data it could be that the wires are not connected, so try to play with wires or electronic is faulty inside the battery

Step 3. Interpreting the battery parameters
- Read Charging Current and Charging Voltage Parameters

- if both are different than 0 then the battery is not locked, so it should be working, you can go into Charge Tab and charge the battery, if it is charging then the battery is fine
- it at least one parameter is 0 then it is: LOCKED or System Present pin is not connected or (rarely) in a Safe State
- check voltage cells

- if voltages are over-discharged, it depends on the cell chemistry, for example between 0 to 1500mV then probably the battery is locked and cannot be revived
- note that 0mV could mean that cell is not present in the battery. In the above example there are only 2 groups of cells connected in series. You can check how many cells are in series by reading Design Voltage parameters from Static Data and divide it by 3700mV (which is the typical nominal voltage of a li-ion cell)
- try to revive the battery by setting an Output Voltage = Voltage + 500mV

- the idea is to apply a higher voltage to the battery connector in order to see if it is charging or not (Current > 0mV)
- in the same time Voltage parameters should be monitored, if it is increasing then Output Voltage should also be increased until there is positive current. If the voltage is the same, then the battery is locked and cannot be saved

Automatic method:
- be sure you connect the wires from NLBA1 laptop battery analyzer to laptop battery correctly (see step 1 and step 2 from Manual method)
- go into Repair Tab and press Wake up battery button like in the picture below:

- watch Intelligent log since all messages are printed there

Trying to charge the battery in the Charge tab is also fine to see if the battery is charging. Try it:

If you don't see a charging current (positive current: Current parameter > 0) then the battery is considered dead. Also check if the battery is not fully charged. If a battery is Fully charged then it doesn't allow charging -> Go into Discharge tab and try to discharge it. If you see a negative current (Current parameter < 0) then the battery is working in principle.