Hi,
Yes, they do. I use the Mophie duce pack and it will charge my phone
when flat to about %80. Other wise, I can just leave the case on and the
iPhone will use the cases battery until its dead, then use its own, It
extends my battery life by about two thirds. I find it very handy and
its not too big either.
Cheers,
Brett
On 11/01/2013 3:57 PM, David Gross wrote:
I have been surfing the internet concerning Iphone cases which claim
to extend the phone battery life.
I guess some contain a actual additional battery, some plug into ac power.
Has anyone used these types of products?
Do they work?
Will they work on an iphone 3gs?
Thanks
David Gross
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