Clean logger tube and all O-rings before reassembly.

Replace the desiccation pack.

When re-fitting the logger cap with the three holes (IR-diodes and orientation pin) make sure to orient the head in the right direction so that the darker IR diode meets the transparent IR diode of the reader device and vice versa.

When re-assembled crimp previously pried open edge slightly to secure logger metal cap in place.

Connect to the logger using the Solinst Levellogger Software. The power loss appears to wipe the internal clock and all data from the logger. If you need recover data from the logger I would recommend to supply just over 3 V to the logger while the old battery is still connected and then perform a data download.