Honeywell RTH6300B Operating Manual page 17

Battery replacement
Press down and pull to remove.
Replace Battery
Insert fresh AA alkaline
batteries, then reinstall
battery holder.
RTH6300B Programmable Thermostat
Install fresh batteries immediately when the
REPLACE BATTERY warning begins flashing. The
warning flashes about two months before the bat-
teries are depleted.
Even if the warning does not appear, you should
replace batteries once a year, or before leaving
home for more than a month.
If batteries are inserted within two minutes, the
time and day will not have to be reset. All other
settings are permanently stored in memory and
do not require battery power.
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