Supra NiTRO-X User Manual page 21

Playtime may vary depending on the
volume that you use
Output mA
6.5
7.5
8.5
9.5
10.5
11.5
Battery life in
hours
11.2
10
9
8.1
7.3
6.7
Over time, the battery efficiency will
decline to eventually become totally
ineffective. The length of a battery life
depends on many parameters but by
following the advices mentioned above
ensures maximum service life. When the
batteries stop working, these should be
recycled in accordance with the recycling
procedures for regular batteries.