Buying help - Windows 10 laptop with the best battery backup under 20K


Hi , I want a laptop to use while traveling or when there is no power.
My primary usage will be web programming / browsing.
Means I will be using Google Chrome most of the time with lots of tabs open. I will have to keep dreamweaver open in teh background , notepad , and an FTP software. may be photoshop sometimes....

Even the Micromax Canvas Lapbook L1160 will suit my needs , but it seems to have only 2GB RAM.
Is there any other laptop/laptab with 4 GB RAM and good battery backup ?
Windows 10 is must.
Full size USB ports are must.
WiFi is must

No need for Touchscreen / DVD writer
I will not play games in it , no video editing/converting.
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