battery showing low temperature.

arindam bose, this is a pretty new phone and I would suggest that you have it fixed under warranty. The usual causes for this error are issues with the battery connector, failed btemp line on the circuit board, bad battery, bad charging port flex. So if I would fix it outside the warranty (bad idea) I'd start with a new charger, then a new battery, then do some fault finding on your logic board. Again, use your warranty.