July 31st, 2011, 08:35 AM
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#2 (permalink)
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Senior Member
Join Date: Jun 2010
Location: Black Forest
Posts: 4,497
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A safe way is to use a portable charger 
I use JustMobile Gum Pro, 4400mAh and 120g in the pocket.
EDIT: Your question:
You can use batteries with higher capacity.
Doesn't harm to the phone.
The risk is the source of this batteries.
Harry
__________________
Google Translate is to blame for my grammar
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Last edited by Harry2; July 31st, 2011 at 08:42 AM.
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