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Help Battery problems on my S2

bojjo

Newbie
Hi Android lovers,

A few days ago I've noticed something very strange on my S2 device. Every time I remove the battery to change my SIM card, the battery life drops drastically. For example: the battery is at 50% but once I've changed my SIM card the battery life drops at 12% within 10-20 seconds.

Here are some screen shots:
imgur: the simple image sharer
imgur: the simple image sharer

What seems to be the problem? I'm the only one who encounters this problem?
 
Why is that? So, if my device is fully charged and I decided to change my SIM card is normal for the battery to drop to 35-40% in less than 30 seconds?
 
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