Lower signal quality tends to use more battery. On standby if you lose signal, the phone will use more power trying to re-acquire a signal than it would with a constant signal. Also with a weaker signal the phone may have to retransmit more and therefore use more power that way.
Cell phones are limited to 1 watt maximum transmission power; but most of the time they use significantly less. If a phone is in a marginal area, it can maintain a signal by increasing the transmission power -- but it comes at the cost of a huge hit to battery life.
R.Isaac Sajan
A.P/CSE
Ponjesly College of Engineering
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