During this CMCO I am trapped in kampung, and we do not have broadband here. So I have to use my phone mobile data, wifi tethering... so I can use the internet with my laptop for work.
I did that everyday for a month, and I think im killing my phone battery this way! My phone will constantly need to plug in the whole day.

Is there any other solution to this? I am thinking to check if Maxis offer like dual sim, so I can have one sim card used on a portable wifi modem, another on my phone as usual ? So my hp no need to take the battery hit with wifi tethering 24/7 ...

Any advice? is this the way to go?

Look for maxis multisim. But multisim is not applicable for unlimited plan.