What type of batteries does the RT520TX thermostat require?
The RT520TX thermostat requires 2 x AA 1.5V alkaline batteries. You should not use rechargeable batteries, and batteries should be placed into the battery slot located in the back of the thermostat. Always ensure the AC mains power is switched off before replacing the batteries.
From the official Salus Rt520tx Thermostat manual, page 1
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