Karan Ji, this is far from exhaustive or publication-grade, but here goes:

I was looking into Arjun MBT specs and the possibility of having an electric tank, with drop-and-replace battery packs, of course. The current 1400 HP motor weighs 4299 lbs [1]. It turns out that electric motors in Tesla and from Bosch can easily do 1 HP / lb [2,3]. So a 1400 HP motor pack with 4 electric motors would only weigh 1400 lbs. Electric tank weight savings so far: 2899 lbs.

The Arjun has a 1610 liter diesel fuel tank for a range of 200 km and the fuel alone would weigh 3020 lbs [4,5]. In contrast, the weight of the battery pack in one Tesla is estimated to be 1323 lbs [3]. The weight of 4 such battery packs for a 4-motor system without compromising range would be 5292 lbs.

Electric tank weight advantage = 4299 - 1400 + 3020 - 5292 = 627 lbs or 284.4 kg

In other words, the weight of the tank crew is completely negated.

While I was going to say that considerable radiator weight can be saved when getting rid of an internal combustion engine, I decided against considering that advantage because lithium batteries don't fare well above 45C, so the batteries would need a cooling system anyway and I'm considering no weight advantage there.

I do think an electric tank would have a considerably lower thermal signature though - making it more stealthy against thermal imaging weapons, and be so much quieter. Acceleration and reversing would be so much easier as well.

References:

[1]

MTU engine for Arjun [2]

Bosch motors[3]

Tesla weight distribution[4]

Arjun fuel capacity[5]

Diesel fuel weight