Power drain on call

[devirc]

Hi,

I have a dramatic power drain while on call on my Elf...
(almost 10% for 10min call)
I there a way to keep my precious battery power ?
New Radio ? ROM ?
In other usage situations the battery seems "normal"...

Here are my Elf details:

Touch version : Elf
Device ID : ELF010000
CID : HTC__203
IPL : 3.10.0002
SPL : 3.10.cmonex
ROM Version : 3.07.720.03
ExtROM Version : Cooked by dsixda
Operator Version: Onyx Micro 4.2
AKU Version : 1.2.7
Page Pool : 4 MB
RAM Size : 64 MB
ROM Size : 128 MB
Model No. : ELF0300

radio is the 3.39...

thanx