USER MANUAL
STM 550 / EMSI
–
ENOCEAN MULTISENSOR FOR IOT APPLICATIONS
© 2020 EnOcean | www.enocean.com F-710-017, V1.0
STM 550 / EMSI User Manual | v1.3 | September 2020 | Page 28/97
4.3
Backup battery
STM 550 provides a backup battery interface to mount a CR1632 battery for cases with
insufficient ambient light. The backup battery has to be installed with the negative pole point-
ing upwards (i.e. towards the side of the solar cell). Check the
‘+’ and ‘
-
‘
polarity markings
on the housing for correct battery orientation as shown in
Figure
Figure 15
–
Backup battery slot with polarity markings
EnOcean recommends Renata CR1632 due to its low self-discharge and high capacity. Gloves
should be used when installing a backup battery to avoid contamination of the isolation area
between the contacts that could lead to a higher self-discharge.
The backup battery can be removed (ejected) by using a small, non-conductive item (e.g.
wooden toothpick) to push the battery out via the battery ejector slot shown in Figure 14.
4.3.1
Safety remarks
Please familiarize yourself with the following safety remarks before using a backup battery:
Do not insert any tools into the battery slot or the battery ejection slot. Doing so
could create a short circuit or damage the PCB resulting in permanent damage.
CAUTION: Risk of damage or explosion if a battery of incorrect type is used.
This product can contain a coin/button cell battery. If the coin/button cell battery
is swallowed, it can cause severe internal burns in just 2 hours and can lead to
death.
Keep new and used batteries away from children.