It's just a normal paper business card probably about 1/16 inches (~1.5 mm) thick. For me it helped battery life.Is it gonna help with battery life?
Sent from my HTC Sensation using xda app-developers app
I believe the issue is do to poor contact between the battery and the pins in the housing on the phone. The poor connection causes the battery to push more power which results in it going beyond the safe threshold of milliwattts. When the battery goes beyond this level there is a failsafe to prevent the battery from doing something crazy like overheating or exploding.
This isn't a problem with all phones. But it has helped quite a few people. It only takes a few seconds and it couldn't hurt anything.
For me, it solved my problem 100%
The worst that can happen is it doesn't solve your problem.
In this case I recommend cleaning the contacts on the battery and housing. If that doesn't work, try adjusting the ground pin.
Swiftly sent from my Sensation via XDA premium