In article , Martin Bonner wrote:
On Jun 9, 12:47*am, "george [dicegeorge]"
wrote:
oh yes, now I look again it is 1.3Ah
which means 1.3 amps at 18volts for an hour

Or 13A at 18V for 1/10th an hour == 6 minutes
Or 26A at 18V for 3 minutes

Roughly, it isn't linear. It'll be 1.3Ah at some rated current, and
if you draw twice that current, you'll get a little bit less than half
the time. If you draw ten times the current, you'll get noticably less
than ten times the time.