Thanks for your post above, I am having difficultly with a board which has an Telit module gc864, it keeps intermintently dropping using a single Lithium Thionyl Chloride saft battery lsh20. It seems it cannot provide the 2A peeks. I have an buck boost to increase the voltage from 3.6 to about 4 volts and have tried the caps after the buck boost and before the gsm module but the problem persists. I am wondering if you have any reference designs using a Lithium Thionyl Chloride saft battery which you could share.
Thanks and Regards Mark