what kind of power supply do you use duiring flashing?

[Obioban]

Just weighing in with my two cents here. In my experience there is a significant difference in what's required depending on whether you're flashing an updated data binary (what is commonly referred to as a "tune") or whether you're flashing the full DME program file. So long as your battery is semi decent flashing an updated tune with MSSFlasher or the like without a charger is almost certainly fine. Flashing the full prog binary is a different story and you will definitely want a good continuous supply. fwiw I am running a stock battery, less than 2 years old. I did a full prog flash with my 10A continuous supply hooked up and ancillary's like aircon, radio, lights, etc. turned off, and by the end of that process, even with the 10A supply, the battery charge had dropped enough for it to noticeably struggle to turn the engine over on first start....

ymmv - but that's my experience.

^100% agreed. Full binary, not using MSSFLASHER, is a looooooong process where the car should be hooked up to power.

But, not too much reason to do that very often.