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I am reading ISTA documentation. It says "This battery charge mode is set at the factory on delivery of the devices and must not be changed. The set maximum voltage of 14.8 volts in battery charge mode is not to be exceeded.". Where does it say that 14.8V is CONSTANT????? It specifically says that charger SHALL be in charge mode. And 14.8V is maximum allowed but in no way a constant.

It also says "Make sure that the vehicle voltage does not drop below 13.0 volts while vehicle programming/encoding is in progress.". I usually use my 100A power supply in special programming mode with 13.5V set for programming and never ever had any problems.