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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 evening 

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