"The Stethoset transmitter uses smart charging to keep the rechargeable batteries at the right level and help them last longer.
Charging temperature
Charge the batteries only when the temperature is between 5°C and 40°C (41°F to 104°F).
Do not charge outside this temperature range.
Storing for long periods
If you will not use the stethoset receiver for a long time, make sure the rechargeable battery is at least 50% charged (half full).
Store in a cool, dry place."
Are there special instructions for battery maintenance?
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