guys, i got a problem with my iphone 5c.
i bought SG set from 1gadget.
currently on ios 7.1
i'm an average user. only use seldomly for fb, whatsapp and also instagram.
previously, my phone battery can up to 5 hours usage time with 12 hours standby. (i'm not sure its normal or not)
but, for the past 2-3 days, my phone battery become not consistent. sometimes it can up to 2hrs 30min usage time with 10 hrs standby.
what i'm worried is, my battery % not consistent. from 100% fully charge, about 1 hour standby time, it jump to 60%. when i charge it back, the battery % become 80%.
then, when my iphone battery become 25%, i just leave it on the table about 15 minutes, got msg, check, the battery % decresing to 1%!
quite weird actually. i don't know what to do now. is it normal or not?
and should i change the battery or should i claimed the warranty.
because my phone still under warranty, however in SG.

have you tried to recalibrate the battery by fully discharge the battery till it turn off and charge back to 100% once a month?
from the looks of it might be a calibration issue.. if its still not solve after battery calibration u may want to send it back to apple for warranty... might be the battery are already starting to wear down or faulty...
but i have a hunch that the battery are already faulty... might as well send it for warranty back to apple as i assume your warranty are still valid...