What type and how many batteries does the Rt20 RF thermostat require, and how long do they last?
The thermostat requires 2 x 1.5V LR03/AAA batteries. The battery lifetime is greater than 1 year, and in normal use the average battery life is about 12 months. (Pages 22, 27)
From the official Bosch RT20 Rf Room Thermostat manual, page 22
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