Tata Nexon EV

All the compact SUV options you've listed are powered by turbo-petrol engines, and since you are looking for efficiency, be warned, in typical city driving (stop-go conditions), these turbo-petrol engines aren't likely to be very efficient. 

Also, these are very sensitive to the driving style and ambient conditions, which can drop the mileage down to single digits. Among the options you've listed, the Mahindra XUV3XO 1.2 Turbo (MPI) AT is likely to satiate your need for performance while offering a smoother and comfortable experience overall. 

Another option you may consider is the Citroen Basalt X/Aircross X, provided there is a Citroen touchpoint in your city. However, if you want to keep the running costs down at all costs without sacrificing performance, go for the Tata Nexon EV 45.

Your vehicle's battery and alternator usually don't give up in just three years. Have you installed any aftermarket accessories? Something might be draining battery power, even after the vehicle has been turned off, commonly known as parasitic drain. Ask the service centre to thoroughly check each fuse to identify the solution. 

Since you have already spent on repairs, and assuming the problem has been resolved, you should keep the vehicle and continue using it. Selling the car will not only result in a financial loss, but you will also have to put in more money to purchase a replacement vehicle.

Since your running is 500km a month and within city limits, an EV makes sense for you. However, given your budget is around Rs 10 lakh, both the MG Windsor EV and Tata Nexon EV are more expensive than that. Alternatively, you should consider the Tata Punch EV. 

The ARAI claimed Tata Punch EV range is 265 km for the smaller 25 kWh battery pack version and 365 km for the larger 35 kWh long range (LR) version, with a real-world LR range of around 229 km. Power and torque outputs are 82hp and 114 Nm for Standard and 122 hp and 190 Nm for Long Range. The Punch EV is ideal for urban users who want a compact, well-equipped EV with solid performance and comfort. Tata Punch EV prices start at Rs 9.99 lakh and go up to Rs 14.44 lakh (ex-showroom). 

The upcoming Fronx hybrid is expected to be a full or strong hybrid and thus will deliver a good fuel efficiency; however, it is still some time away. If you need a car soon or in the next few months, then the Nexon EV would be best.