Battery Life, Not Bandwidth, Sometimes is the Key Mobile Limitation

The average power consumption for a 10-minute CDMA circuit-switched call in a recent test was about half that of a 4G Long Term Evolution call. That will get better over time, but right now, it appears that LTE voice calls are going to drain batteries about twice as fast as talking using CDMA networks. 

A 10-minute call using CDMA consumed 680 milliwatts (mW) while the average consumption for a VoLTE call of the same duration was 1358 mW. 

Spirent estimated that on a full charge, its test smartphone could support 502.6 minutes of talk time using CDMA only, but the same charge would only deliver 251.8 minutes of talk time using VoIP on the 4G network. And that’s with all other data communications turned off. And how often do users turn off unneeded radios?