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Technical noteThe standard avalanche transceiver battery test (as specified in EN 300-718) requires that the transceiver is left in transmit mode for 200 hours at 10C (50F) and it should then be able to receive a signal for at least one hour at -10C (14F). The transceiver comparison table displays the manufacture's stated battery life. For example, when the table lists "250/15", it means that the manufacture states that the transceiver can receive for at least 250 hours (presumably at 50F) or receive for 15 hours (presumably at 14F).

Always use fresh, high quality, alkaline batteries and replace them before they get low. All of the batteries should be replaced at the same time using the same brand. Never use rechargeable batteries.

Beginning with version 3.2, the Mammut Pulse can accept either alkaline or lithium batteries. Lithium batteries are lighter, last longer (according to Mammut, in normal conditions the batteries will last 50% longer than with alkaline), don't corrode, and are more expensive. Note that you must change an internal setting in the Pulse before changing the battery type.

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Mammut Pulse Plus Avalanche Package
Pulse Package

The batteries should be removed if you are not going to use the transceiver for a longer period of time (e.g., at the end of your winter) to prevent damage due to battery leakage. You should also remove the batteries if you ship your transceiver, because the transceiver may be exposed to extreme temperatures and pressure changes during shipping. Leaking batteries will void most transceiver warranties. According to Mammut, you should return your transceiver to the manufacture and have the terminal contacts replaced if you see any corrosion on the terminals.

Digital transceivers display the strength of the batteries on the screen. Some manufactures say that there is still enough reserve in the batteries to operate when the battery level displays 0%. Here are a few manufacture's statements regarding their battery indicators:

  • The Mammut Pulse manual says the beacon will send for at least 20 hours and then receive for one hour when the battery indicator says 20%.
  • The Pieps DSP Sport/Pro manual says that when the battery indicator (a bar) is empty but not yet blinking, you can transmit for at least 20 hours and then receive for one hour. That manual also states that when the DSPs' battery is 1/3rd charged, it will transmit from between 20 and 120 hours. That's a ridiculously imprecise range. The older (i.e., yellow) DSP's displayed the battery's status as a percentage.

The consequences of your batteries dying before you should be obvious.

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