MSI GT72 DOMINATOR (GTX 970M) - Manual (Page 30)

Getting Started
3-4
 The battery pack uses Lithium-ion battery cells that have no “memory effect.” It is
unnecessary to discharge the battery before recharging. However, to optimize the life
of battery, we suggest that consuming the battery power completely once a month is
necessary.
 The actual charging time will be determined by the applications in use.