If you are outside and out of battery, the best thing to have with you is a second backup battery.  But what if you used the backup battery last time and forgot to charge it?  Most likely you aren't carrying a charger with you and if you are, the problem becomes that you have to wait while it is charging.  A solution may be is to have a battery powered USB charger in the glove box or briefcase.  And the best thing is that even if the battery inside the charger is out of power, you can buy AA batteries anywhere any time.  And another great thing is you can use the phone right away when it is charging.  I bought this Verbatim AA Power Pack from Amazon for less than $15.  It gives about 50% charge on 4 AA 1900mAh 1.2v Eneloop batteries on the Samsung Galaxy Note 2.

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