If Your android battery droid fast than this is also a reason.check your mobile network mode setting.If you are use 4G or 3G you battery are droid faster in 4G than 3G.
In android setting you can set and fixed it easily.here follow below step.
Step 1: Go Setting=>Mobile Network Mode
Step 2: Select Network mode
Step 3:Select lte for 4G
Select CDMA for 3G
Select GSM for 2g
Please note this option are change depend on your mobile.So don't worry if any option are not in your cell.
In android setting you can set and fixed it easily.here follow below step.
Step 1: Go Setting=>Mobile Network Mode
Step 2: Select Network mode
Step 3:Select lte for 4G
Select CDMA for 3G
Select GSM for 2g
Please note this option are change depend on your mobile.So don't worry if any option are not in your cell.