CWK
Contributor
It was on a LOB. Standard procedure uas for all divers to remove regulators from the tank after a dive so that boat boys can refill the tank. Divers reattach the regulator after the gas is analysed just prior to the next dive. Not more than 10 mins to dive sites.13 dives seems too short. Maybe you are leaving the transmitter pressurized too long. After initial setup of a tank and checking the pressure I release the system pressure to turn off the transmitter.
I had changed the battery before joining the LOB for a week with 16 dives scheduled. The warning came on after th 13th dive.