Bearing in mind the peculiar power supply challenges in the country, you are better off investing in a laptop with a strong battery that can guarantee at least up to 10 hours of battery life on average use.
For a notebook, a battery capacity of 10,000mAH/3.7V or higher is adequately sufficient to begin with, especially as both the total charging capacity and life of a laptop computer’s battery will diminish as you use your computer.