[Elecraft] bttery life of K2 using internal battery

[Joseph Trombino Jr]

Am wondering about the typical life of the internal battery for the K2.

Assuming about 2.50 amps of current used when operating at circa 5W and 
given the amp hour rating of the internal battery at 2.9 ah what is the 
typical life of the battery for a typical QRP outing in the field???

I've been toting around a 7 ah gel cell for my K2 but the internal battery 
option sure looks attractive in terms of portability and ease of use.

Would appreciate comments from users who take their K2 to the field.

                                73, Joe W2KJ
                                I QRP, therefore I am