I see the signal affect battery issue every day with tons of different phones... Being I work inside a BestBuy (Giant Steel / Brick Cage) everyone's phones battery life takes a beating... So yeah, local area will affect it greatly...
Also I second the idea of keeping a charging source close by... It usually isnt too hard to find a computer to drag some juice out of, so you could just carry around a USB cable or keep a spare at the place of work, etc...
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