Under corporate plan, I had bought a ZTE W670 from Airtel which has a 2300 mAh battery and works straight 10-12 hours on one single charge
Later colleagues got Alcatel WM40CJ which has an 1800 mAh battery.
Reception wise, both work perfectly.
I can see that Huawei e5573 has an1500 mAh battery.
So make a wise choice.
Eventually, we all tend to forget charging our devices and a longer battery is an added advantage while travelling.
Edit: I could find one on Amazon ZTE WD670 black
Rs.500. Their Dongle is sold free but it does not have wifi.How much did you pay for this device under your corporate plan?
Even I could not find a solution to unlock.I understand this ZTE model can not be unlocked while other two can be.
+1Rs.500.