I am looking at upgrading one of my old Dell Latitudes, it's an D830. My son needs this laptop for school, and it needs about a 6 hour battery span. This laptop, however, only gets about 45 mins on average, and he can't plug it in at school. This laptop I found was perfect for him because it was rugged. I remember awhile ago I bought a secondary laptop battery for this computer (an older one, not the same model) and it installed through the CD slot. Same thing, as I have found for this computer. So, my question. Where is the best resource to purchase one of these batteries?
SPECS OF LATITUDE (as configured)
4GB of RAM (1GB original)
500GB WD Blue hard drive (80GB original)
Windows 8.1 Professional (XP original)
Thank you so much!