What to do during power interruption?

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Hi /g/
I live in South America, and I work from home.
I need the computer and internet for my work.
Sometimes, there are power interruptions in my neighborhood, so that's a problem for my work. Those interruptions sometimes last 1 hour, sometimes 4 hours, sometimes the entire day.

I work with a laptop, so I can still use it without power for 3 or 4 hours, and I have a cellphone with 3g internet connection, so I enable the cellphone "hotspot" and use 3g internet from my laptop. However, that 3g internet connection usually is too slow or with too much lag. I need the internet to chat to my co-workers and to connect to servers. Having lag makes me wanna kill myself

Do you have any suggestion on how to keep working even without energy?
Laptop+3g sometimes is not enought as the laptop's battery and or the cellphone's battery runs out, and as I mentioned, the internet connection is too slow.