What batteries does the BP7250 require and how long do they last?

The BP7250 requires 4 'AA' alkaline or manganese batteries (1.5V). Battery life is approximately 1,000 measurements using new alkaline batteries. When the low battery symbol flashes on the display, it is recommended you replace all 4 batteries at the same time with new ones. Do not mix new and used batteries or different brands together. (Page 10, 19, 44)