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These are 10s4p lithium Battery Scooter packs (460Wh). They contain 40 Panasonic NCR18650BD cells.
These are best suited for building 36v battery packs as they are testing at least 95% capacity.
Any voltage below 30v at the Discharge port is an indication that the BMS is hibernation mode. The Internal BMS can be turned on by applying voltage to the charging port (smaller cable) The battery pack will remain in the "ON" state for as long as it has a voltage of 30v or above and without a load. Applying a load will cause the battery to shut 'OFF" after 5 seconds then remain off for 60 seconds, ON for 5 seconds, OFF for 60 seconds for an indefinite amount of cycles. Using this Arduino Controller connected to the blue cable will instruct the BMS to remain ON for an indefinite amount of time.
Once the Cells are out and clean you will have to test them using a charger like this.
Normally comes with female connectors attached, you will need to get the male connectors.
Typical Capacity: 3200mAh
Nominal Capcity: 3100mAh
Voltage nominal: 3.6V
Charge voltage cut-off: 4.2V
Discharging cut-off: 2.5V
Module Dimentions: 16"x 3"x1.75"
Available in singles and quantities of 4 packs.