Morris, The easiest thing is to connect a jumper from Pin 1 of the 10-pin header to one of the holes used to previously mount the battery. I would suggest putting a resistor (1-4.7K is fine) and diode in the middle of this wire to limit current in case of any mistakes and prevent any possibility of the onboard charger from damaging your external battery. A couple of standard alkaline AAA cells will keep the VP backed up for MANY years. There are quite a few rechargeable LiOn coin cells that will fit on the board also, but it is just about impossible to find the cell Motorola used with the welded pins. Just about any rechargeable LiOn cell you can find will fit, you'll just need to hardwire from the legs on the battery to the holes in the VP board. Randy Warner ____________________________________________________________ -----Original Message----- From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Morris Odell Sent: Friday, December 28, 2007 11:24 PM To: time-nuts@febo.com Subject: [time-nuts] VP oncore question Hi all, This is my first post although I have been reading this list for quite a while. I am an Aussie time nut with both a HP Z3815A and a Shera-ised 5061A ticking away in my basement, I have a question about the venerable VP Oncore receiver. I have obtained a few of these very cheaply and want to put them to use. Originally they all had the on-board rechargeable battery option but the batteries are long gone. These receivers have the battery pin on the connector disconnected to avoid problems with non rechargeable batteries connected to the on-board charger. Is it possible to rework the board to allow the use of an external non-rechargeable backup battery, or if not, where can I find a suitable tabbed 3 volt rechargeable Li button cell to install on the board? Any help greatly appreciated Morris Odell VK3DOC Melbourne, Australia _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.