Palm III, and all the following Palms, did not have the word "Pilot" in their name due to the previously mentioned trademark dispute. The Palm III had an IR port, backlight, and flash memory. The latter allowed the user to upgrade Palm OS, or, with some external applications, to store programs or data in flash memory. It ran on two standard AAA batteries. It was able to retain enough energy for 10–15 minutes to prevent data loss during battery replacement. It had 2 megabytes of memory, large at the time, and used Palm OS 3. (Palm also produced an upgrade card for the Pilot series, which made them functionally equivalent to a Palm III.)