The battery's internal undervoltage/overvoltage protection mini-circuit is locked after reaching undervoltage threshod of ~2.5V.
The voltage at the battery terminals is then 0V.
The internal bettry protection circuit is very simple and it includes two power FETs and a controller IC.
After the battery is disharged to its undervoltage limit (2.5V), the protection circuit disconnects its terminal so when the charger is connected to the USB power supply (5V) it sees 0V at the buttery terminals and it doesn't start to charge the battery. Instead of charging the battery the charger enter to protection mode and outputs only ~0.8V.
In order to reset the internal battery protection circuit manualy I have to disconnect it from the charger and connect it monintarly to a current-limited power supply with a voltage larger then the current battery voltage (3V>2.5V). After this procedure the battery voltage measured at the terminals is ~2.5V (Instead of 0V) and then charger is able to detect the battery and charge it.
My question is, Is there a way to make the chager to detect the battry or make it to try to reset the internal battery protection circuit using the BQ24040 charger (For example the charger will start trying to charge even though no battery is detected and output ~4V with low current)?
