Samsung is about to use a 7000mAH of battery in the upcoming Galaxy M41 smartphone also, on Galaxy M31s likely as per the BIS certification. The actual rated battery capacity is 6800mAH and has a charging limit of 4.43V. It’s a dual battery system with Lithium-ion batteries and Li-ion batteries. 

The Galaxy M41 will launch soon and it comes with a punch-hole design for the selfie camera, quad rear cameras, and a whopping 7000mAH battery. Will confirm more specs & features soon in the upcoming days. So Stay tuned guys.