How to fix sudden charge drop in stand by? I have an android device running Lollipop 5.1 (the brand is local in my country) which has a battery draining problem in stand by mode. 


It drains about 10% of battery every hour or so without having any custom launcher
The battery capacity is 1850 mAh
WiFi is turned off. I only use one SIM
I have been monitoring the phone since I bought it, I haven't used it to call someone and my network signal is completely stable and the only time spent on screen is to check battery percentage.


Should I be worried or is it okay for such a device to consume this much battery in stand by mode?

Note: I tried installing launchers which seem to be causing more battery consumption in stand-by.  I uninstalled all third party battery saver apps and turned android integrated power saver on.I also tried factory resetting the phone twice.
Sounds like your battery is trash. Sometimes you buy a new phone and get a bad battery.

Take it back where you bought it and tell them the battery is bad. They should give you a new battery free of charge.