- Apr 19, 2004
- Arlington, TX
Both of these scanners have a Real Time Clock (RTC) onboard powered by an internal battery (not the AA's in the case of the 436). When you first get your scanner, leave the 536 plugged in and on for a while and leave the USB connected to power on the 436. It actually takes about 50 hours to trickle the internal battery up to a full charge, which will last for over a week. If the back-up power source is depleted, you'll be prompted to enter the time upon power-up.