M1?singtel?
I'm have came up with a conclusion comparing between M1 postpaid and starhub prepaid.
the former drains battery like 1% every 1hr to 1.5hr on idle mode, with Android OS on top. keep running twice as much as on starhub.
example while i was on M1 4G from fully charged, though SOT clocked at 1h55m at 90% left, the Android OS remained at the top with the component running at 1h5m, about 3hrs of standby with usage.
while over Starhub 4G, with 14hrs of usage standby, Android OS running at only 44m with SOT of 1h55m too.
the battery graph was not as steep as the one shown via M1 network.