BIG EDIT to my above post.

For Good results scrap my comment about rechargeables. Putting out 1.2 volts (not 1.5) they will work, but WILL NOT bring your phone back 'from the dead' like disposables alkalines will.

RECHARGEABLES ARE NOT SUITABLE for emergency use. Buy long shell life disposables to be better Equipped to Survive.

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All good things...
a) come to those who wait.
b) come to an end.