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