High battery drain with micro SIM

[Ken_Jutsu]

Hello everyone,

My SIM card is a nano SIM which I have in the upper SIM slot. However, I want to use a SD card, so I moved the nano SIM to the bottom slot with the help of a nano to mico SIM adapter. For about 2 days, everything was working fine, but then the battery started draining extremely fast. Looking under Battery in settings, it is always "Android Core Apps" with Included packages: "User Dictionary, Contacts Storage and Huawei Contacts" that is causing the drain. At this point, Mobile Data also stops working, although it is turned on. If I then switch off the phone and remove the SD card and take the nano SIM out of the adapter and place it in the upper SIM slot, everything is back to normal. Any ideas?

Phone details:
ALE-L02 Dual SIM flashed to ALE-L21C432B170 Dual SIM.

GSam Labs - Battery Monitor - Export Data

Android Core Apps

19 Sep 2016 10:31:18 AM 

Usage Details

CPU Usage:40m 33s
CPU Usage (Background Only):40m 33s
Keep Awake:25m 36s
Number of Wake Locks:4344
Bytes Sent:5,67 MB
Bytes Received:1,73 MB
App UID:10003

Wakelock Detail

MMS Connectivity25,6m(5)
*alarm*1,8s(4335)
com.android.providers.contacts.IntentServiceWithWakeLock0,2s(1)
*sync*/com.android.contacts/com.android.huawei.phone/Phone0,1s(3)

Included Packages

User Dictionary
Contacts Storage
Huawei Contacts

Included Processes

com.android.contacts
*wakelock*
com.android.contacts:cacheservice
android.process.acore

 

[Ken_Jutsu]

I guess there are a few things I could try:

1. Get a proper micro SIM, and not use an adapter
2. Convert from dual SIM firmware to single SIM firmware

In my mind it must either be the actual SIM card I am using, or some hardware issue.

 

[Suleiman01]

I guess there are a few things I could try:
Get a proper micro SIM, and not use an adapter
Convert from dual SIM firmware to single SIM firmware

In my mind it must either be the actual SIM card I am using, or some hardware issue.

I use micro sim and sdcard. I don't have battery drain issue. However there is one way you might be able to get battery life. Convert the preferred network to 2G when you are not using mobile data. I know this may sound old but it can slow down battery drain.