Update | TUV Rheinland certifies a new battery that may be for the Samsung Galaxy M31s
Update: New leaks indicate that Safety Korea has approved the same battery pack as in the original article, thus providing more possible evidence of its existence and that it might go to the Galaxy M31s on this device's launch. In addition, some marks and texts seen on the battery in this regulator's official photos suggest that BIS has also certified the component. Therefore, the M31s may indeed exist and, furthermore, is destined for the Indian market.
Original: The Galaxy M30s was a successful phone last year, not least because of its impressive battery life among mid-rangers. Some evidence that Samsung has decided its formula is far from broken in its successor has now arisen. It suggests that the M31s is indeed to be launched soon, with the same size battery as in its predecessor.
TUV Rheinland has reportedly approved a new battery from this OEM. Its model number is EB-BM317ABY, which has some degree of cominality with what may be the M31s' own number (SM-M317). This would be in line with Samsung's typical parts-labeling practices.
The regulator has apparently certified the EB-BM317ABY as a battery with a rated capacity of 5380mAh and a typical capacity of 6000mAh. The latter is the figure likely to appear on spec sheets and marketing material, should this new leak prove valid, of course.
Nevertheless, it still drops no clues as to exactly when the Samsung Galaxy M31s would start to be listed with retailers.