Battery does not discharge or cut off discharge suddenly

Possible reasons：

1. Over-Discharge Protection

Benchmark: 

Single cell <2.5V 

Battery pack<10V

Solution: Disconnect loads from battery and recharge the battery with 14.6V 20A charger to override the protection and regain power.

2. Voltage Compatibility Issues

The battery matches with the using device's peak voltage's requirment but the running voltage's requirment exceeding the battery's specification

Solution: Fully recharge the battery with 14.6V 20A LiFePO4 charger and test it with a slight load and see if issues recurred. If there is no issues with the testing device, it is confirmed compatibility issues with previous using devices.