It will be extended automatically. No need to pay. Whatsapp will remain free in India, period.
WhatsApp will be free for life in India | Deccan Chronicle
I use almost the same setup but the board I use is different. It's called Banana Pro and it has some advantages over the rPi. An inbuilt Wifi module, a SATA port, gigabit ethernet port etc. The development is not as strong and active as rPi but it works for my setup. I run raspbian on it too...
Mi Powerbank does give 2 amps output. Maybe something's wrong with your Powerbank. The Powerbanks you've mentioned supports 2 amps out too. TP-LINK 10,000 mAh power bank can also be considered as it has good user reviews.
Sony CP-AD2 USB AC Adaptor *www.amazon.in/dp/B00FF4GBYA/ref=cm_sw_r_awd_r8I.vbNY7686X
This one comes with a short cable. There's one more variant available for Rs.799 which comes with a 1.5 mtr cable. You can get whatever suits you.
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