AH6RP amateur radio blog

Thomas Distributing carries the 9 Volt Ultralife Lithium Battery, with a 1200 ma nominal capacity... at 10 ma drain, to 5.4 volts. At 27 ohms, it briefly supplies about 10 volts, drops quickly to about 8.3, and remains above 7.2 for 39 hours (see curve at Thomas site, note 27 ma into 300 ohms is 8.1 volts.)
That's about 1,050 mah.