VoLTE uses twice as much battery as a current 2G call

The report came from wireless testing and measurement vendor Spirent Communications, which was acquired by Metrico Wireless in September.

A 10 minute call used 680 milliwatts (mW) on CDMA an 1358 mW on VoLTE. Spirent estimated that on a full charge, and with all other data communications turned off, its test smartphone could deliver 502.6 minutes of talk time using CDMA, but only 251.8 minutes of talk time using VoLTE.

Test network was not named, but it is MetroPCS for sure.

//examiner.com