Hi Omer, Omer, unless I'm missing the big picture, I was wondering: Is the PIC current consumption that much higher running directly from the 3.6V lithium (as opposed to 2.7V or 2.8V) that warrants going through all of this trouble? I'm not trying to mean or anything -- just trying to be a helpful devil's advocate. What is the PIC current consumption at Vdd = 3.6 volts? What is the PIC current consumption at Vdd = 2.7 volts? Have you determined the delta current consumption between these two scenarios? It would be interesting to see what it is in your case. Best regards, Ken Pergola -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads