BQ29700: Problem with the battery protection
On the page 18 of the ds:http://www.ti.com/lit/ds/symlink/bq2970.pdf


  When the battery is connected for the first time, the discharging
  circuit might not be enabled. In this case, short the V– pin to the
  VSS pin. Alternatively, connect the charger between the Pack+ and Pack
  – terminals in the system.