HTC Desire LeeDrOiD_HD_V3.3.3_GB-R5, Baseband, Kernel with VZA 1.0 connected to 7.1.2_GA_3268.UBUNTU8_64 UBUNTU8_64 NE.

Menu > Settings > Accounts and Sync > VZA

Untick Sync causes the device to heat up considerably and therefore kills the battery.

Why you'd do this - there's no option for quiet time

Just an observation that I thought I should share. Hope this helps someone somewhere.