Yay, a Malaysian!
I've a regular iPhone 5 (which is identical to the 5c in the internals anyway, except a slightly smaller battery), and I normally get a usage time of around 7 hours and a standby time of 1 day 2 hours.
It was replaced by Machines under the lock screen and battery recall programme.
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Does your area have stable Maxis LTE coverage? Sometimes I disable LTE and find that on 3G, my battery life goes straight to hell.
In where I used to live (Saujana near the Subang airport), 3G was pretty bad but LTE was quite stable. So leaving LTE disabled only drained my battery.
I've since moved to Melbourne, where coverage is good everywhere.
Back in my native QT in NZ, coverage is almost nonexistent though.