Most Delta-Q battery charge algorithms have a "Maintenance Mode" where it will monitor the battery voltage after a charging cycle has completed. After the battery has self-discharged over time, the charger will automatically start charging the battery to keep it topped up.
For most cases, it is recommended to have the vehicle stored with the charger connected to AC so the charger can maintain battery voltage when the vehicle or machine is stored for long periods of time. For lead-acid batteries, this is to maintain the state of health of the battery and the convenience of immediately having a charged vehicle/machine after storage.
Delta-Q also encourages the user to double-check and confirm that their algorithm uses a Maintenance Mode and the recommended use of the charger with the manufacturer of the vehicle or machine.
Delta-Q does not take any responsibility and is not liable for any damage caused through use of the charger.