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Symptoms
Battery power exhausts in a few hours, a full recharge is not enough to cover a normal workday and a recharge is required before eveningÂ
Cause
Under particular network condition, the radio subsystem uses high power transmission, depending on network coverage and network congestion.
Workaround
Set network mode to 2G only, instead of the default mode (2G/3G). This typically improves performances, at least, doubling battery duration.
Resolution
Under investigation