S-Disk J battery is easily and quickly user replaceable too. New battery kits can be purchased (each kit includes a new battery, a news o-ring that must always be replaced whenever logger is opened and substitution instructions) or the service for battery replacement at Tecnosoft, usually along with recalibration. Opening tools are available too, to be used alone or in combination. The easiest way is to use the Universal Opening Tool (watch the Video Tutorial on Tecnosoft Youtube Channel). If the opening tool for loggers is used alone, the logger must be put on a vice, if the opening tool for PressureDisk is used alone it is a necessary a tool to unscrew it without damage, if it cannot be opened by hands.
Note: if used below -30°C, battery life will be highly reduced. Mission max duration at -80°C: 12 hours. Using the logger for long periods below -40°C will constantly reduce mission max duration. For longer missions purchase a S-MicroW series logger with -80°C special battery.