Advertisements If a Samsung S4040R battery is replaced does the unit have to call home? Which would in turn force me back to 6.3e. Something that will not happen if I can help it! BTW the Panasonic CR3032 voltage is 3.729 VDC when the unit is plugged in and 3.280 VDC when unplugged. The latter voltage, according to Panasonic specs, indicates a load of about 1 microamp. The former voltage implies that the battery can be replaced with the line cord connected -with great care, of course- thereby preserving whatever data the battery protects.