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