Got another Dell Latitude d600 laptop had password on but was able to clear and unlock this laptop - YouTube
Dell Latitude D600 HDD PC Laptops & Netbooks for Sale | Shop New & Used Laptops | eBay
Amazon.com: Fancy Buying Latitude D600 New Laptop Battery for Dell Latitude D505 D610 D520 D500 D510 D530 / 600M, fits P/N C1295 6Y270 3R305-12 Months Warranty (6 Cells 11.1V 5200mAh) : Electronics
Synergy Digital CMOS/BIOS Battery, Works with Dell Latitude D600 CMOS/BIOS, (Li-Ion, 3V, 200 mAh) Ultra High Capacity, Compatible with Asus 0G4221 Battery - Walmart.com