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Battery life is a critical issue for most wireless mic users. Masque Sound tested
different batteries in various transmitters, measuring their voltage over a period
of time. The resulting graphs that were generated are presented here. Although the
results of these tests are not strictly scientific, they are actual results with
random batteries. Masque Sound provides this information only as a service to wireless
users.
No warranty of actual performance is implied or suggested.
Test Conditions
- The same transmitter was used to test each of the batteries shown in each graph.
- A data-logging multimeter was used to sample the battery voltage every 30 seconds.
- Each transmitter was checked to insure that its current draw met published manufacturers
specs.
- Each battery tested was a new battery with a short “shelf life”, purchased
specifically for these tests.
- Each transmitter was tested with no audio input. Bench tests show that actual modulation
causes almost no perceptible change in the current draw of the transmitter.
Sennheiser SK50 with two AA batteries
The graph below shows the comparative battery life of various AA batteries in a
SK50 body pack transmitter.
The SK50 graph cuts off at 1.75 volts, which is where the transmitter stops operating.
The lines at 2.5 and 2 volts show where the battery sled indication changes from
high to medium and medium to low respectively. The Energizer and Everactive batteries
lasted 1.5 to 2 hours longer than the Duracell family of batteries.
Sennheiser SKM3072 with one 9v battery
The graph below shows the comparative battery life of various 9v batteries in a
SKM3072 hand held transmitter.
Notice that the Lithium battery lasted almost 26 hours and the alkaline batteries
between 9.5 and 11 hours. The Walgreen Supercell test was interrupted before it
was complete, but the data suggests that it was not performing as well as the other
brands.
Sennheiser SK250 with three AA batteries
The graph below shows the comparative battery life of various AA batteries in a
SK250 body pack transmitter.
The SK250 graph cuts off at 2.5 volts, which is where the transmitter stops operating.
The lines at 3.6 and 2.8 volts show where the battery sled indication changes from
high to medium and medium to low respectively. The lithium batteries lasted between
30 minutes and 2 hours longer than the alkaline batteries. It should be noted that
the same transmitter was not used for each of the tests in this instance.
Sennheiser SKM5000 with two AA batteries
The graph below shows the comparative battery life of various AA batteries in a
SKM5000 hand held transmitter.
The SKM5000 graph cuts off at 1.7 volts, which is where the transmitter stops operating.
The lines at 2.6 and 2.2 volts show where the battery sled indication changes from
high to medium and medium to low respectively.
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